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

Delhi Smog

For Delhi’s Traffic Police, More Air Means More Problems

  Have you have ever wondered about the effects of Delhi’s air on people who work outdoors? How about Delhi’s traffic police? We sure have at Smart Air, and we have been waiting for research to catch up with our ruminations. A study on Delhi’s traffic police officers, published in January 2017, finally … Read more

Shanghai Technical Inspection Bureau Mask Tests

It’s tough to get good mask data on a wide range of consumer masks. I’ve posted some of my own test data and test data from Dr. Saint Cyr. But another great source of even more mask tests comes from the Shanghai Municipal Bureau of Quality and Technical Supervision. I’ve linked to … Read more

How Accurate is the 1 Micron Dylos? New Test

As always, I’m making the raw data and more details on the testing method publicly available, including humidity data. Should we subtract the 10 micron particles? One reasonable question is, should we take into account the 10 micron particles? Remember the standard Dylos gives readings for 1 micron and 10 … Read more

Winter Is Coming

Another year, another winter. As winter arrives in Beijing and soon in Shanghai, I got to wondering: how much worse is winter air in Beijing? To get to the bottom of it, I analyzed the last eight years of US Embassy PM 2.5 data for Beijing and Shanghai. I found … Read more

Cost of air pollution

Death in the Air Infographic by World Bank

The World Bank released a new report titled “The Cost of Air Pollution: strengthening the economic case for action” which talks about the consequences of air pollution and in it, they detail how air pollution is now the 4th leading risk factor for deaths worldwide. That’s worse than the deaths … Read more

10 Facts About Air Pollution

Air pollution can be confusing. As a topic, it’s often not well understood or well-reported about. That means separating fact from fiction can often be hard to do. In some cases, it is difficult to distinguish research-backed facts and findings from common misconceptions–misconceptions that sometimes even get repeated in the … Read more

Flickr Photo

Is Summer Air Better Than Winter Air?

Summer is here, bringing with it clearer skies and certainly cleaner air. Right? Summer always seems to drive out the dense clouds of pollution that suffocate many Indian cities. However, while summer air is in fact cleaner than air during other seasons, it’s still far from safe according to the … Read more

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