Size of pollen particles 10 microns to 200 microns cherry willow pine grass pollen feature

Can Masks Filter Pollen and Prevent Hay Fever?

Every year, spring’s blossoms bring with them wave of pollen. For places like Beijing, it’s also the start of the ‘snowy season’, with the hundreds of willow trees producing their fluffy catkin friends and the sniffles that follow. But how can we avoid the uncomfortable coughing and sneezing? Which masks … Read more

Did China’s Air Quality Improve in 2019?

After a big improvement in 2018, new data shows China’s war on air pollution is slowing down. A Smart Air analysis of 2019 PM2.5 data for China’s 15 largest cities found that more than half saw worse air quality over 2018. Maps comparing average PM2.5 in December 2018 to December 2019 … Read more

How Many Trees Need to Be Planted to Solve Delhi’s Air Pollution?

When Delhi’s air pollution spikes, netizens in the nation’s capital often bring up the solution of planting trees. For instance, this user on the question-answer site Quora asks “how many trees does Delhi need to combat its air pollution problem?” However, environmental research suggests that planting trees are an incredibly … Read more

PM2.5 vs. PM10: The Difference in Particle Air Pollution

PM2.5 and PM10 are the two types of air pollution that the WHO estimates affect “more people than any other pollutant,” but they are different. Here’s how the two contrast. PM2.5 vs. PM10 The difference between PM10 and PM2.5 is size. But before we get to size, “PM” refers to particulate … Read more

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