![]() ![]() “Ironically, with us all being sheltered at home, traffic is almost nonexistent in the city, which means that the outdoor air quality is particularly clean,” Minott said. (And if you’re really concerned, you can check the levels of ozone and particulate matter in your area by visiting the EPA’s Air Quality Index and entering your zip code.) Neither season is affecting the air outdoors right now, which means it’s the best time of year to throw those windows open wide. ![]() In the fall and early winter, on the other hand, temperature inversions can layer warm air on top of colder air, effectively trapping those pollutants in the atmosphere. ![]() It occurs when environmental pollutants emitted by cars, power plants, refineries and other sources react in the presence of sunlight and heat - so ozone smog levels tend to be higher in warmer weather, generally peaking at the end of bright summer days. ![]() Some outdoor pollutants are seasonal – for example, ground-level ozone, which Minott explained is a mixture of chemicals: oxides of nitrogen and volatile organic compounds. ![]()
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