Nationwide Record Highs vs. Record Lows

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Nationwide Record Highs vs. Record Lows

  • Published: Aug 30th, 2019

The analysis compiles daily temperature records for the United States since 1920, and shows the percentage of records in each decade that were hot or cold.

Happy Birthday National Parks

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Happy Birthday National Parks

  • Published: Aug 28th, 2019

As we celebrate the 103rd birthday of the National Park Service, we examine the effect of climate change on our parks and update our earlier analysis of national park temperature trends.

 Summer Nights are Warming Across the U.S.

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Summer Nights are Warming Across the U.S.

  • Published: Aug 7th, 2019

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

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How Summer Nights are Changing In Your Area

  • Published: Aug 7th, 2019

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

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Ozone Season Lengths Across the Country

  • Published: Jul 31st, 2019

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

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Explainer: How Ground-Level Ozone Is Formed

  • Published: Jul 31st, 2019

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

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How Ozone Levels Are Changing in Your City

  • Published: Jul 31st, 2019

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

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Hotter Summers Mean More Stagnant Air

  • Published: Jul 24th, 2019

Hotter summers often lead to more stagnant air—trapping air pollutants that can cause health problems.