Topics Trends
Local: records by decade
Take a look at how record high temperatures have compared to record lows in your city.
Summer Nights are Warming Across the U.S.
Summer minimum temperatures are warming fast across the U.S. — leading to added health risks and higher energy costs
How Summer Nights are Changing In Your Area
Is the summer heat making it hard to sleep? Here’s how the summer minimum temperatures have been changing in your city.
Ozone Season Lengths Across the Country
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.
Explainer: How Ground-Level Ozone Is Formed
Ground-level ozone is a hazardous air pollutant and a key component of smog. Here’s how it forms.
How Ozone Levels Are Changing in Your City
Ozone pollution can reach unhealthy levels in your city. Here’s how the number of unhealthy ozone days have changed over time.
Hotter Summers Mean More Stagnant Air
Hotter summers often lead to more stagnant air—trapping air pollutants that can cause health problems.
Nationwide Trends in Air Stagnation Since 1973
Since NOAA’s Index began in 1973, the number of annual stagnant days has increased in 83% of the contiguous U.S. cities analyzed.
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