I'm quite familiar with this because I run every day. When at about 2 or 3 miles it feels like somebody's punched me in the throat and chest (and I feel decent otherwise), I know it's a bad air day.
Air quality is just an indicator, a very noticeable one, that's saying, "Hey, chill on the pollution." We're topping off on bad ozone, the colorless gas that forms near the ground when the emissions of cars, power plants, industrial boilers, refineries and chemical plants react chemically in sunlight. There's also an increasing load of carbon monoxide, sulfur dioxide and particle pollution.
Runner's cough
At first, I thought I was just getting old. I'm 50. But then I started asking around. No, runners say, you feel bad probably because of the air. This is Fresno, they say, where the nearby majestic Sierra are often masked by haze of murky gray/white/brown.
