Hotter summers often lead to more stagnant air—trapping air pollutants that can cause health problems.
Since NOAA’s Index began in 1973, the number of annual stagnant days has increased in 83% of the contiguous U.S. cities analyzed.
Climate change is making summer scorchers all the more extreme—check the trend for area.
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.
As the number of large wildfires increases with climate change, so does the number of acres burned.
Hotter years have brought higher numbers of large western wildfires.