Tag - Olansi Air Purifier

About hydrogen water generator

Sydney, Nov 29 (IANS) Australian researchers have reported the use of a new ultra-thin catalyst to split water into its two components, oxygen and hydrogen, to be converted and used as fuel, a report said on Tuesday.

The researchers at the Griffith University used the sheet-like, highly efficient catalysts that has long-term stability and help spur the process to create economically viable clean fuel.

The latest research was published in the Nature Energy journal, Xinhua news reported.

Just as sunlight generates electricity, the water-splitting process could do the same via the generation of clean chemical fuel such as hydrogen, a report quoted Professor Huijin Zhao, the director of Griffith’s Centre.

Hydrogen would be a promising clean fuel over petrol in the foreseeable future, Zhao said.

“Scientifically it’s already demonstrated, it’s already working but to do this in a way that’s economically viable, there’s still a bit of work to do and we need government policy, general public support,” he said.

“You also need those big companies to realise they should not dig up out of the ground anymore,” he said.

“It’s not just a simple technology issue.”

Our olansi hydrogen water generator:h31

Global Air Purifier Market: Trends, Opportunities and Forecasts (2016 – 2021) is available at ReportsnReports.com. The air purifier market report spreads across 148 pages market drivers, challenges, trends, developments, competitive landscapes and strategic recommendations.

The Global Air Purifier Market: Trends, Opportunities and Forecasts (2016-2021) report along with executive summary also provides product overview and air purifier market analysis. The report has been analysed By Value (Historic 2011-15, Forecast 2016E-2021F), By Filter Technology: By Value, Percentage (2015), Percentage (Forecast 2021F) and By Region: By Value and End User, Percentage (2015), Percentage (Forecast 2021F).

 

The market is driven by the surging pollution levels, depleting air quality leading to increasing prevalence of the air borne diseases.

 

Global Air Purifiers Market has been growing at a moderate rate over the last five years on account of upsurge in the carbon dioxide emissions leading to surging prevalence of deaths owing to air pollution. During 2016-21, Air Purifiers Market is anticipated to grow at an increased rate on the back of intensifying government regulations in various parts of the world. Moreover, increasing demand for various types of air purifiers such as vehicle mounted as well as portable air purifiers has been anticipated to propel thrust in the sales of air purifiers in the future.

 

According to research report, Global Air Purifier Market: Trends, Opportunities and Forecasts (2016-2021) – (By Value, By Filter Technology – HEPA, ION & Ozone, Activated Carbon; By Region; By Country – US, UK, Canada, China, India; Key Players; Recommendations), global Air Purifiers Market is projected to exhibit a CAGR of over 12% during 2015 2020.

In 2015, HEPA air purifiers comprised of around 60.39% share of the overall market owing to is the imperative role being played by the HEPA in the abatement of ambient as well as household air pollution. Few of the leading companies operating in Global Air Purifiers Market are Coway, Camfil, IQ Air, Honeywell Inc., etc.

 

 

Breathe easy with an air purifier

Breathe easy with an air purifier

Some time ago Noida-based entrepreneur Sushmita Sinha’s son had a cough that lasted for almost a month. A worried Sinha decided to buy an air purifier. “It had a dramatic effect. Earlier, my son would lie awake at night coughing, but now he sleeps peacefully,” says Sinha. 
An air purifier can be a panacea for many. “If pollutants like pollen, dust, dust mites, mould, tobacco smoke and pet dander trigger seasonal allergies in you; if there is someone with asthma, a child with an underdeveloped immune system, a pregnant lady or a pet in the house; or you live in a construction zone, you should buy an air purifier,” says Jayati Singh, business head – air, health and wellness.
The first thing to look for in an air purifier is a high efficiency particulate air (HEPA) filter. “Buy an air purifier with a HEPA filter and not one with a HEPA-type filter,” says Marzin Shroff, chief executive officer – direct sales and senior vice president – marketing, Eureka Forbes. An activated carbon filter and microbial disinfection are other must-have features.
Also pay heed to the air purifier’s Clean Air Delivery Rate (CADR), a measure of the purified air being delivered (metre cubes per hour) by an air purifier operating at its highest speed setting. “Match the appropriate CADR to your room size,” says Mahesh Gupta, chairman, Kent RO Systems.
Buy an air purifier that is suited to your needs. According to Singh, the HEPA filter is a boon for an asthmatic, while an ozone-based purifier should be strictly avoided. ECARF certified models (a European certification meant to help allergic customers) with HEPA filters are ideal for people with allergies. A device with a pre-filter is a must for those residing in areas with heavy construction activity. For people living in places with high levels of gases, odours and pets, activated carbon works well.
If you are going to use the machine in your bedroom, buy a machine with a low level of noise. Also, buy one with adjustable speed settings so that you can turn it up to a higher setting when you are not in the room. “Purchase a machine with a slightly higher square-foot capacity than you need, so that you can run it effectively on its quieter ‘low’ setting, resulting in less noise and less energy consumption,” says Singh. A display, which shows the quality of indoor air, is a useful feature. Some air purifiers come with a humidifier, which helps maintain the right level of humidity indoors.
When choosing a manufacturer, go for one whose replaceable items such as filters will be easily available. Most air purifiers have two filters — a HEPA filter and a carbon filter — that have to be changed every six months or one year. Pay attention to the number of years of warranty provided with the machine. Prices of room purifiers can begin from Rs 9,000 and go as high as Rs 40,000. According to Shroff of Eureka Forbes, “The price depends on the room size, CADR, number of stages of filtration, and so on.”

“New Delhi breath” masks and air purifiers are out of stock

The air filled with sour, spicy eyes, choking throat, difficulty breathing, visibility is only tens of meters, all submerged in the thick haze. This is the last few days the reporter in the India capital New Delhi experienced serious haze experience.

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, prices have some anti haze masks soared to 2000 rupees (about 200 yuan) one.

“The times of India reported on 8 may >11 said, New Delhi haze in 1952 caused more than 4 thousand deaths in the London haze far behind. On the front page of the India times on the visiting British Prime Minister said:” welcome to the gas chamber, Teresa. “The CNN reported that, according to the U.S. Embassy in New Delhi, on the earth the most polluted city, now can not find the clean air.

India meteorological department said that since the end of October to New Delhi and North Indian region ushered in more than 20 years, the most severe haze, this situation will continue for about a week. According to the India air detection index shows that in recent days, New Delhi PM2.5 high security value is more than 17 times, the highest value was up to 1100 in some areas of India: Hindu >8 reported that the New Delhi area hospital patients increase 30%. India Centre for science and environment report, 10 thousand to 30 thousand people each year due to the haze of death in New Delhi.

At the same time, the pollution has caused serious economic losses in.2013, the world bank assessment, the deterioration of the environment in India every year to pay at least $80 billion in economic cost. The Hindu > reported that due to haze caused low visibility, multi car accident occurred in New Delhi area on the highway, causing many deaths.

With the city of New Delhi, many people and cars, the pollution is becoming more and more heavy pollution days for 46 days. In 1996 the government of India to take specific measures, once had a more obvious effect. However, by 2013, India pollution days increased to 74 days.

At present, New Delhi city vehicle population has reached 25 million, nearly 10 million vehicles. India Centre for science and environment scholar C Manu Vanni told reporters that in addition to vehicle emissions, mainly caused by the haze in New Delhi and North India so serious is the Diwali people set off firecrackers, at present it is agricultural area of Northwest India straw burning this is the season, the farmers to keep the lowest soil fertility cost. Another reason is due to the local government did not implement strict pollution control measures.

In the face of severe haze, New Delhi chief minister Koi Val held an emergency cabinet meeting on 6 May to discuss solutions. The decision of the government of New Delhi since 7 in New Delhi 3700 school holiday for three days, all construction work halted for 5 days, the next 10 days to prohibit the use of all fuel generators, temporarily shut down New Delhi’s Bada coal-fired power plant for 10 days, the government also called for all the people of New Delhi in the home office. From 7 onwards, uninterrupted implementation of sprinkler sprinkler operation, reduce the dust on the road. At the same time, New Delhi to the India central government proposed the implementation of artificial rainfall system to control the dust in the air. The New Delhi municipal government on 7 additional measures, including the car at the age of 15 years of above the vehicle must be canceled heavy trucks and truck passing, can not enter the city, all on fire control, shut down polluting enterprises, New Delhi City banned firecrackers.

At the same time, the pollution has caused serious economic losses in.2013, the world bank assessment, the deterioration of the environment in India every year to pay at least $80 billion in economic cost. The Hindu > reported that due to haze caused low visibility, multi car accident occurred in New Delhi area on the highway, causing many deaths.

With the city of New Delhi, many people and cars, the pollution is becoming more and more heavy pollution days for 46 days. In 1996 the government of India to take specific measures, once had a more obvious effect. However, by 2013, India pollution days increased to 74 days.

At present, New Delhi city vehicle population has reached 25 million, nearly 10 million vehicles. India Centre for science and environment scholar C Manu Vanni told reporters that in addition to vehicle emissions, mainly caused by the haze in New Delhi and North India so serious is the Diwali people set off firecrackers, at present it is agricultural area of Northwest India straw burning this is the season, the farmers to keep the lowest soil fertility cost. Another reason is due to the local government did not implement strict pollution control measures.

In the face of severe haze, New Delhi chief minister Koi Val held an emergency cabinet meeting on 6 May to discuss solutions. The decision of the government of New Delhi since 7 in New Delhi 3700 school holiday for three days, all construction work halted for 5 days, the next 10 days to prohibit the use of all fuel generators, temporarily shut down New Delhi’s Bada coal-fired power plant for 10 days, the government also called for all the people of New Delhi in the home office. From 7 onwards, uninterrupted implementation of sprinkler sprinkler operation, reduce the dust on the road. At the same time, New Delhi to the India central government proposed the implementation of artificial rainfall system to control the dust in the air. The New Delhi municipal government on 7 additional measures, including the car at the age of 15 years of above the vehicle must be canceled heavy trucks and truck passing, can not enter the city, all on fire control, shut down polluting enterprises, New Delhi City banned firecrackers.

Although the New Delhi government has taken these measures, but experts believe that this is a repeat of last year’s practice, too little too late. Times of India >7 headlines reported that serious haze is still not alert the government, preventing haze normalization should take control measures.

Air purifier sales spike in India as its cities battle pollution

As the government fumbles over effective measures to curb severe air quality in India’s capital of New Delhi, people are increasingly looking at air purifiers for relief.

SEE ALSO: NASA reveals why New Delhi is blanketed with deadly smog

Major ecommerce businesses in India are reporting significant surge in the sales of air purifier units in the country. The product category, which has existed in India for over two decades but struggled to become a household name, has suddenly become a talking point among people on social media.

Amazon India says it sold three times more air purifiers this Diwali compared to the previous month. Almost half of all these orders came from cities such as Delhi, Gurgaon and Bangalore. Flipkart had similar findings, noting that it has seen 2.5 times growth in air purifier units sale compared to last year.

The sudden interest in air purifying products among people comes as several Indian cities report of increasingly growing air pollution after Diwali. The festival of light, which sees many people burst crackers, combined with the burning of farmlands and residual fodders in nearby states, have resulted in an unprecedented severe air quality in New Delhi and several other states in India.

Five days after Diwali, for instance, the air quality index reading of the national capital is still classified as “hazardous”. A report on UNICEF published this week found that over two billion children worldwide breathe polluted air. India and China were among the most affected countries.

Not just air purifiers, but people are also actively looking for air masks for immediate comfort. “Sales of pollution masks have jumped 6X in the last few days with customer demand being 13X over last year. The highest number of orders for pollution masks were placed by customers on Nov. 1. The demand continues to be high from northern India with most orders coming from Delhi,” an Amazon India spokesperson told Mashable India. The surge in sales happened a couple of days after Diwali, which fell on Oct. 30 this year.

While The Government Is Taking Its Own Time, These People Are Fighting For Clean Air

The conversation around air pollution is not a new one for India with several attempts being made in the past – some successful and some not as much – to educate citizen on the need to combat air pollution through the year.

Unfortunately, despite an all round effort to clean up the air, the results are bleak. With Delhi topping the chart in the country with the most polluted air. There have been some individuals who have worked against the odds to fight to the right to better air quality in the country.

Namita Gupta

Air Warrior

Namita Gupta has been surviving on antibiotics because of pollution. What bothered her even more was the discomfort her daughter, who is an asthma patient, faced. She thought of shifting to the US when the idea of making an app that could monitor pollution struck her. She decided against the plan and created an App from scratch. Her App, Airveda, helps monitor air pollution levels and is quite simple to operate.

Saurabh Bhasin

Air Warrior

Shocked by the impact of air pollution on him as well as his family, Saurabh Bhasin and his wife have launched a legal battle with the Delhi government for cleaning the city’s air. Among the plaintiffs is his 15-month-old daughter and two other other toddlers. The case has been filed in the Supreme Court stating that the poisonous air deprives them of their “right to life” as guaranteed by the Constitution.

“I don’t expect things to improve overnight, but I do want to see government bodies take cognisance of how drastic it is, and take some serious measures to make it better,” Bhasin told the media.

Swechha Foundation

Air Warrior

The Swechha Foundation has been promoting plantation drives across Delhi and promoting better eco-health in sensitive zones like the Yamuna among many others. During the monsoon months each year, the foundation conducts a “Monsoon Wooding” programme and with a target of planting 2,000 new trees each year, the foundation has already planted more than 10,000 trees in and around the capital.

Graviky labs

Air Warrior

The Bengaluru-based lab has been capturing soot from vehicular emissions and use it to extensively to remove heavy metals and carcinogens, before distilling it into this dense black ink. Soot, produced due to the incomplete burning of fossil fuels, easily enters the body’s bloodstream when inhaled at traffic signals, wreaking havoc.

“Air-Ink is formulated by industry standards. We can put it to a range of uses—regular inks, screen painting, newspaper ink, oil-based paints, alcohol-based paints, spray cans, even calligraphy ink,” says Nikhil Kaushik, one of the founders of the company.

Clean Air India Movement (CLAIM)

Air Warrior

CLAIM

Clean Air India Movement (CLAIM) is a nationwide launched campaign launched in May 2015. The campaign is speared by an air purifier company . The Clean Air India Movement is a 360° degree campaign aimed at engaging, encouraging, and educating Indian citizens to adopt air friendly measures in the interest of the country and its children. “Our campaign aim is to tell people that we are not helpless individuals when it comes to challenging air pollution. Even simple acts by individuals or sole companies such as it can make a difference when it comes to showing responsibility and care, which is why we have taken the initiative to make the call and mobilisation for action,” said Kannan .

 

Air purifier popular, choose to pay attention to these 4 indicators

In recent years, the air purifier market demand increased dramatically. In March this year, the formal implementation of new national standard air purifier. The 4 core indicators listed in the new national standard, can make consumers more rational, more intuitive to buy air purifiers. The reporter recently visited the home appliance stores found that many people still do not understand the indicators in the new national standard the significance of the purchase, are often confused.

The air purifier sales hot 

The air purifier sales season in November each year to second years in February. Last month, we store the air purifier sales had exceeded 320 thousand yuan, compared with the same period last year grew by about 10%. Suning Tianyi life appliance sales supervisor Huang Yanfu told reporters, the air purifier sales now account for the store of life general electric 30% sales, the momentum of rapid development.

Every time a small explosion of air pollution, will make the air purifier market ushered in a wave of “outbreak”. “Since 2013, sales of air purifiers showing explosive growth. Especially in 2014, 2015, the average annual growth rate of over the air purifier sales Deputy General Manager 150%. Su ningyun group Limited by Share Ltd in Ningbo area management center Hu Yu told reporters, although just entering the season, but this year he air purifier sales confidence. According to Hu Yu estimates, this year Ningbo air purifier sales reach at least twenty thousand units.

4 indicators to measure product performance

SHARP, Blueair, Olans. ..Today, the market range of air purifier brand many people have no choice. “In fact, no matter what the purification principle, is to detect the air purifier according to the detection method of the same.” Hu Yu told reporters that the measure of an air purifier performance of the 4 core indicators can refer to the new national standard list: clean air volume (hereinafter referred to as Cadr), the cumulative amount of purified (hereinafter referred to as CCM), the purification efficiency and noise.

“Cadr value, clean air volume per unit time through the filter output. In general, the bigger the Cadr value, the purification ability is stronger.” Hu Yu told reporters, usually, the applicable area of clean air available amount multiplied by the coefficient of air purifier (0.07 – 0.12) to estimate. The Cadr value is 400 per hour cubic meters of air purifier for example, its application in the area of 28 square meters to 48 square meters. As for the air purifier to output that can work long, mainly to see the value of CCM. That is to say, the bigger the CCM value, the service life of the screen is longer.

Hu Yu also told reporters that the air purifier mainly relates to particles and formaldehyde two pollutants. If an air purifier is marked with particles of Cadr value, CCM value, Cadr value and marked with formaldehyde, CCM value, indicating that the air purifier can purify particles can also purify formaldehyde.

Purification efficiency and the operation noise of the air purifier, is also an important indicator to measure the performance of the product. “In general, clean energy efficiency rating for air purifier, air purifier is superior to the qualified level.” Hu Yu said that the air purifier is the implementation of noise as low as possible.3 months of the new national standard, the highest air purifier the noise should not exceed 70 dB.

Purchase should be based on their own needs

“After the implementation of new national standards, the core index of air purifier in the packaging or instructions of the conspicuous position marked, consumers should only compare related values, can find a suitable air purifier.” the city Consumer Protection Committee Deputy Secretary General in Leimin told reporters that some business performance in order to more intuitive publicity of air purifier also, the relevant numerical made stickers in the air purifier. An air purifier to determine whether the implementation of the new national standard, standard execution view the product packaging or instructions. If the standard is GB / t18801-2015, is according to the new international standard production.

In addition to the related numerical selection air purifier, consumers can choose according to the different functions of different air purifiers. Young and old groups can choose the air purifier with microorganism removal function, but has the function of air purifiers generally higher prices; if consumers do not want to often replace the filter, can choose CCM value of air purifier is bigger; if consumers use air purifier in a newly renovated room, can choose Cadr value formaldehyde air purifier with formaldehyde high CCM value.

The use of air purifiers, when to replace the filter, is a lot of consumer concerns. The reporter visited found that the current situation of air cleaner production at present most manufacturers can automatically prompt screen. For example, PHILPS air purifier, just change the filter, the air purifier will be displayed on the display of “C7”; when the filter needs to be cleaned, the air purifier will be displayed on the display of “F0”; when the filter needs to be replaced, display the word “A3” is the air purifier on the screen. The current status of air purifier Olans display screen more directly. According to guideintroduction, Olans air purifier filter display the number of days to 0, consumers should replace the filter.

Hydrogen Water — the New Trends of Health & Beauty

Hydrogen Water — the New Trends of Health & Beauty

 

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Established in 2006,located in Guangzhou,China.Olansi company is a professional manufacturer and exporter of Air Purifier,Water Purifier,Water Dispenser and related accessories.We own a powerful R&D team with highly qualified designers and engineers,which annually launch many new models.We provide our customers with OEM & ODM services. 

Our company has achieved the ISO9001:2008 Quality System Certification,the Chinese National Mandatory Product 3C Certification and the National Drinking Water Product Health Safety Certification by the Ministry of Public Health of China.

10 Years. We specialize in providing OEM&ODM service of Water /Air Purification,Healthcare Appliance to Medium and large enterprises

Overseas Sales Team

Olansi Healthcare Co.,Ltd.

(GuangZhou Olans Water Treatment Equipments Co.,Ltd)

Ph: +86 20 86000438 / +86 2034717515

Email:daniel@olansi.net

site:https://www.olansi.net

 

Beijing to have world’s biggest air purifier to fight smog

China will deploy world’s largest outdoor air purifier designed by a Dutch engineer in its smog-hit capital Beijing, as the thick heavily-polluted haze returned to haunt the city, driving people indoors. The seven-meter-tall tower, brainchild of Dutch designer Daan Roosegaarde, is undergoing last-minute checks in Beijing’s 751 D Park art area. The ‘Smog Free Tower’ will soon be opened to the public, and will be toured across the country, state-run Global Times said, quoting China Forum of Environmental Journalists, an NGO under China’s Ministry of Environmental Protection.

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The tower can capture about 75 per cent of PM 2.5 and PM 10 tiny particles in its vicinity and then release purified air to create a “bubble” of fresh air around it. The tower can clean 30,000 cubic meters of air per hour through its patented ozone-free ion technology. Beijing has been plagued with heavy smog since the beginning of October. The city’s environmental authorities issued a “yellow alert” for air pollution on Tuesday.

“Yellow alert” is the third-most serious level in a four tier colour-code warning system. Red is the most serious and orange the second-most serious while blue is the least serious pollution level.

The average PM2.5 density of the small deadly polluted particles crossed over 300 today even though a cold front in the morning cleared the smog a bit. Liu Guozheng, CFEJ secretary-general said the tower is intended to warn authorities never to forget their duty and encourage the public to pull together to combat the smog.

The public, meanwhile, are bemused by the tower’s function and have called on authorities to curb dangerous sources of polluting particles, the daily said.

Netizens expressed their frustration over the tower. “The so-called divine smog cleaner is more like a piece of performance art, which makes almost zero difference to cleaner air in the city. It devours the polluted air and exhales fresh air, but so little it won’t make any difference. The air will stay polluted,” the daily quoted a comment by Sina Weibo user.

Home air purifier:Air Purifiers Help Lungs and Heart

Filtering fine-particle pollutants out of indoor air for just 2 days improved markers of cardiorespiratory health in study volunteers, according to a study from China.

OLS-K06C

In the randomized, crossover trial, the air purifiers, which were designed to filter out fine particulate matter pollutants (less than 2.5 µm in diameter). achieved and maintained 57% reductions of pollutants during the 48 hours (mean concentration 41.3 µg/m3), reported Renjie Chen, PhD, of Fudan University in Shanghai, and colleagues.

The authors also noted significant reductions in blood pressure and inflammatory biomarkers as well as nonsignificant increases in lung function.

“To the best of our knowledge, this is the first study to examine the impact of short-term purification of indoor air on clinical and biochemistry measures of cardiorespiratory health in areas with severe air pollution,” the group wrote in the Journal of the American College of Cardiology.

Shanghai is a city with severe air pollution. Daily outdoor air pollution levels in Shanghai during the study averaged 103 µg/m3, and indoor levels were about the same.

The study involved 35 healthy, nonsmoking college students living in 10 dorm rooms in the city. The rooms were randomized so that half received a functioning air purifier and the other half a sham purifier. The unit was placed in the center of the room and ran for 48 hours. Study volunteers stayed in the rooms with the doors and windows closed during this time.

The researchers evaluated health endpoints and drew blood for analysis after the 48-hour period. After a 2-week washout period, the process was repeated with the sham and functioning home air purifier units reversed.

The blood was analyzed for 14 biomarkers of inflammation, coagulation, and vasoconstriction. All circulating biomarkers decreased in response to the air purification intervention. However, decreases were statistically significant only for sCD40L, a marker of blood coagulation (64.9%, 95% CI 30.3%-82.3%), and for three inflammation markers:

  • MCP-1: 17.5% (95% CI 5.5%-30.8%)
  • Interleukin-1β: 68.1% (95% CI 44.3%-81.7%)
  • Myeloperoxidase: 32.8% (95% CI 5.3%-67.5%)

Systolic blood pressure decreased by 2.7% (95% CI 0.4%-5.1%) and diastolic by 4.8% (95% CI 1.2%-8.5%).

Fractional exhaled nitrous oxide, a marker of respiratory inflammation, decreased by 17% (95% CI 3.6%-32.5%).

The investigators reported modest, nonsignificant improvements in lung function, such as a 3.5% increase in forced expiratory volume in 1 second (95% CI -2.5% to 9.9%). They speculated that these improvements could have become significant if the study had continued longer.

“Although previous studies in countries with cleaner air (Denmark and Canada, etc.) have reported some health benefits due to air filtration, this study provided the first evidence in a country with severe air pollution problems,” Chen told MedPage Today via email.

“Our results showed clear benefits in a much wider range of cardiopulmonary outcomes,” Chen said. “Furthermore, our study found these benefits can be obtained even after a short-term (2-day) use of air purifiers.”

The study had some limitations, namely it was a small and short-term study done in healthy young adults, which may limit the generalizability of the results, and underestimate or miss other potential health effects, Chen explained.

“Bigger health benefits may be expected with long-term air purification and/or in more vulnerable populations (for example, cardiopulmonary patients),” Chen added.

In an accompanying editorial, Sanjay Rajagopalan, MD, of the University of Maryland in Baltimore , and Robert Brook, MD, of the University of Michigan in Ann Arbor, pointed out that “the evidence to date on the impact of improving indoor air quality has been mostly from the West using air purifiers to improve pollutants attributable to specific sources at relatively lower levels.”

“Added to the results from a few previous studies, these new findings bolster the evidence that improving indoor air filtration may be a practical ‘personalized’ method to reduce overall PM2.5 [fine-particle pollutant] exposure and mitigate adverse health effects,” Rajagopalan and Brook wrote.

“The observed improvement in outcomes, despite particulate levels remaining high during air filtration (41.3 µg/m3) supports the prevailing understanding of a log-linear dose-response relationship between exposure and health effects, whereby any lowering of pollution can translate into benefits, with larger absolute benefits the higher the level of air pollution,” they concluded.

But Darryl Zeldin, MD, scientific director at the National Institute of Environmental Health Sciences (NIEHS), offered some caveats about air purifiers.

Patients who ask about the benefits of air purifiers should be advised that they are only effective in small enclosed rooms, such as a bedroom, and they only remove fine particles such as cigarette smoke or combustion products, he told MedPage Today. “Air purifiers generally don’t work well for larger particles, which include common allergens such as dust mite particles, pollens, and mold because these particles rapidly settle and don’t become airborne again unless they’re disturbed.”

Air purifiers can be recommended in smokers’ homes to remove smoke particles from children’s bedrooms. They can also be recommended for homes with high levels of cat, dog, or mouse allergens, which are relatively small and stay airborne for longer periods of time, he said.

As for the study by Chen’s group, with which Zeldin was not involved, “it’s the first I’m aware of that shows air purifiers might have cardiovascular benefits,” he said. “It’s intriguing, but it’s more of a proof-of-principle study. You would need studies with similar methods in larger populations to bear this out.”

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