As long as ozone season sticks around, so do concerns about the health risks of poor air quality. Check out where ozone is an issue across the country.
Ground-level ozone is a hazardous air pollutant and a key component of smog. Here’s how it forms.
Ozone pollution can reach unhealthy levels in your city. Here’s how the number of unhealthy ozone days have changed over time.
While U.S. temperatures have been relatively mild this year, the rest of the world has endured near-record heat.
The past five years have been the hottest on record globally — and 2019 is on pace to continue that trend.
This image puts today’s CO2 levels in historical context. Spoiler alert: we’re off the charts.
CO2 has seasonal fluctuations but its stark, long-term rise is unmistakable.
Yes, CO2 levels have varied in Earth’s past. But today’s levels are the highest in millions of years and increasing at an unprecedented rate.