First lockdown's effect on air pollution was overstated, our study reveals

Exaggerating how much lockdown improved air quality could allow us to underestimate the scale of the air pollution problem.

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Air pollution may contribute to Alzheimer’s and dementia risk – here's what we're learning from brain scans

The tiny air pollutants known as PM2.5, emitted by vehicles, factories and power plants, aren’t just a hazard for lungs. A study finds more brain shrinkage in older women exposed to pollution.

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Wildfire smoke changes dramatically as it ages, and that matters for downwind air quality – here's what we learned flying through smoke plumes

Thousands of chemical compounds in wildfire smoke are interacting with each other and sunlight as the smoke travels. For people downwind, it can become more toxic over time.

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EPA decides to reject the latest science, endanger public health and ignore the law by keeping an outdated fine particle air pollution standard

After a 5-year review, the EPA is leaving US standards for fine particle air pollution unchanged, even though recent studies suggest that tightening them could save thousands of lives yearly.

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