Why Do Heat Waves Make Ozone Pollution So Much Worse?

Boy, is it hot? The gnarly heat wave we’ve been dealing with since last week isn’t quite over yet—and it doesn’t just cause us to sweat and complain. Events like these usually bring awful ozone pollution, too. And that’s stuff people need to worry about, especially as they’re outside enjoying their Fourth of July.

Report: Basically No One Is Safe From Air Pollution

Just about every human on this planet is breathing unhealthy air, according to a new report from the Health Effects Institute, a nonprofit independent research organization. While the report’s central claim—that 95 percent of the world’s population is exposed to air that doesn’t meet the World Health Organization’s…