What Time of Day Is Air Pollution Lowest?

My intuition has always been that there is least air pollution at night because there are fewer cars on the road and fewer factories humming at that time of day.   Pollution Time of Day Guesses   Apparently I’m not alone: 139 voted for their guess about what time of day … Read more

How Healthy Are Delhi Kids’ Lungs?

In 2008, the Chittranjan National Cancer Institute (CNCI) in Kolkata published the results from a study examining the health of lung function among school children, aged 4-17, in Delhi. To test whether children in Delhi fared worse than those outside of the city, the study compared 11,628 children from different parts … Read more

How Visible Is India’s Air Pollution?

Much too visible, according to Astronaut Scott Kelly, who is finishing up his year onboard the International Space Station. On January 12th, Kelly posted the following picture, which shows northern Uttar Pradesh on the left, and the Himalayas and Nepal on the right. In December 2014, NASA released a similar picture highlighting … Read more

Preparing for Air Pollution in Ulaanbaatar, Mongolia

Air purifiers and air pollution are probably the last things that come to mind when thinking of Mongolia. But maybe it should be the first, given how bad the air there is. I was living in Beijing during the airpocalypse, so I decided to buy an air purifier. Then I discovered … Read more

Is Air Pollution a Problem in Mongolia?

Air pollution or grasslands – which is more likely to come to mind when you think of Mongolia? Air purifiers and air pollution masks certainly aren’t top on the packing list when people are heading off to Mongolia, but should they? According to The Guardian, Ulaan Bator is the world’s … Read more

What Time of Day Is PM 2.5 the Lowest?

My intuition has always been that air pollution is lowest at night because there are fewer cars on the road and fewer factories humming. Apparently I’m not alone: 139 voted for their guess about what time of day has the lowest PM 2.5, and night time came in first: I … Read more

Is Guangzhou’s Air Safe?

Beijing’s air pollution is the most famous in China, but that can make people in some other cities think their air is good–at least, not as bad as Beijing’s. But is the air in other cities safe? In 2013, Shanghai had newsworthy air pollution that convinced many people in Shanghai … Read more

How Long Do Smart Air HEPAs Last? At Least 90 Days

The most frequent question people ask me these days is: how long does the HEPA last? This question is important because replacement HEPAs are the biggest long-term cost of clean air. IQ Air charges $370 for its filters. So if you have to replace the HEPA every two weeks, the DIY might … Read more

Smart Air is a social enterprise that creates simple, no-nonsense air purifiers and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.