When the sun comes out in the summer and temperature soar, the air quality in large cities usually takes a turn for the worse -- especially ozone levels.
And it's those hot, summer days when ozone is at its worst. The hot sun "cooks" everyday emissions from motor vehicles, industry, paints, solvents and gasoline fumes, according to the PSCAA.
In the summers — and especially during extreme heat waves -- ozone often reaches dangerous levels in cities or nearby rural areas,"Ozone is made in the atmosphere from chemical reactions and those reactions are more efficient when it's warm," says University of Colorado chemistry professor Joost de Gouw. "So temperature tends to be a really good predictor for ozone pollution.
"Los Angeles has this great combination of a geography that traps pollution, great weather and lots of emissions from all the motor vehicles," de Gouw said. But he added California has been at the forefront of addressing pollution.Dry summer weather can lead to wildfires which add carbon monoxide and particle pollution to the atmosphere. On the other hand, while humidity will make it feel more uncomfortable outside, it can inhibit ozone production.
"We can get very strong inversions in mountainous regions, for instance, and an inversion is very good at trapping pollutants down to the surface," de Gouw said. "So in a lot of areas, for instance, in Salt Lake City, the air quality is worse in the winter because the air is trapped."
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