The US had been reducing surface-level ozone, a harmful pollutant and the main component of smog, but that changed as wildfire activity picked up around 2015.
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The ecological modeling study shows that many plants face a "high risk" of extinction by the end of the century.
More frequent heatwaves and cold snaps are linked with increases in major cardiovascular events that are further exacerbated by air pollution.
Scientists say their findings could help predict when migraine may be more likely.
A new study linking Pittsburgh’s air pollution to thousands of deaths each year has been published just as the EPA moves to weaken pollution standards.
The damage from military attacks on cities can fill the air with pollutants that harm the lungs and stress the heart.
Solar cycles, sea ice and rising electricity use all play a role. So does an unhealthy surprise that has been quietly hiding a large amount of global warming – until now.
Without rapid cuts to fossil fuels and a shift to clean energy, climate change could drive over a billion into hunger by 2100, hitting Africa hard.