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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.
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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.
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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.
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Hotter Summers Mean More Stagnant Air
Hotter summers often lead to more stagnant air—trapping air pollutants that can cause health problems.
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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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2019 Global Temperature Anomalies Through June
While U.S. temperatures have been relatively mild this year, the rest of the world has endured near-record heat.
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2019 Global Temperatures Through June: Among Top 5 Hottest on Record
The past five years have been the hottest on record globally — and 2019 is on pace to continue that trend.
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More Extremely Hot Days (2019)
Climate change is making summer scorchers all the more extreme—check the trend for area.
