Americans did better on aerobic and strength goals But the annual ranking found some worrisome trends on air quality and food ...

Indoor air can be three to five times more polluted than outdoor air, according to the U.S. Environmental Protection Agency, which also notes that most people spend 90 percent of their time indoors.

The current infrastructure also isn’t set up to fully account for the shifting behavior of wildfire smoke, which can travel ...

Air quality in the United States has been generally improving since the Clean Air Act was enacted in 1970, with levels of key pollutants dropping by nearly 80 percent.

Air quality has a direct impact on public health, and experts warn that 2025's data signals a troubling reversal of long-standing gains. Increased ozone and PM2.5 exposure have been tied to asthma ...

That's a 30 percent improvement from yesterday, NBC 5 Storm Team Meteorologist Kevin Jeanes said, where the PM2.5 ranked at 160, leading air quality to be in the "unhealthy" for all groups category.