ENVIRONMENT

Wildland Fires Cause Weeklong Air Quality Decline Across North America

Brown carbon from wildfires affected air quality in parts of the U.S. and Canada during July 2026.

30 July 2026 · 05:54 · 1 sources

Between July 15 and July 22, 2026, air quality worsened across regions of the United States and Canada due to brown carbon emissions from wildland fires. These fires produced smoke that spread over large areas, leading to noticeable smoky skies and degraded air quality conditions. NASA monitored the spread and concentration of the brown carbon particles throughout this period, tracking their impact on the atmosphere.

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NASA Environment — A Week of Smoky Skies Across North America

THE QUESTIONS THIS EVENT LEAVES BEHIND

Wildland Fires Cause Weeklong Air Quality Decline Across North America

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How did regional weather patterns influence the dispersion of brown carbon during this week?

What measures were taken by local authorities in the affected areas to mitigate health risks?

How might ongoing climate change trends affect the frequency and intensity of wildfires contributing to brown carbon emissions?

What technological advancements enable NASA to track smoke particles over large geographic areas?

Did agricultural or urban pollution sources compound the air quality issues attributed to wildland fires during this period?