This was written by Andrew Rosenberg:
We all check the weather forecast for sun, rain, UV, allergies and other information that might affect us as we spend more time outside in the summer. That includes alerts on bad air days, when air pollution levels are high enough to be potentially dangerous, especially for children, those with respiratory concerns like asthma and the elderly.=
Indeed, there is a nice little numbered, color-coded scale for air quality that warns us when extra caution is needed. Ever wonder where that comes from?
The standards used to determine air quality refer to the average amount of a pollutant in the air. Keeping air quality below a standard determined to be bad for your health is an obviously good idea—as is being aware of when the air is bad or unhealthy. Alerts of bad air days are those that exceed the standard, telling us to watch out!
But now, changes underway at the U.S. Environmental Protection Agency (EPA) may make it less likely you’ll see a bad air day warning—even when the air is still unhealthy to breathe. That’s because the Trump administration is planning on reconsidering the standard for ozone, despite the fact that the science clearly shows that doing so would cause harm.
If the administration is successful in its efforts, we determined how many fewer bad air alerts you’d get if you lived in 19 different metropolitan areas.