Toxic smoke dissipates over northeastern US

Residents of the northeastern United States were breathing more easily Friday as smoke from Canadian fires gradually cleared after blanketing several cities in a noxious haze this week.

Fine-tuning air pollution models

Air pollution doesn't affect everybody the same way. And in a new study, researchers developed a method to improve estimates of how, within cities, different communities are exposed to fine particulate matter (PM2.5).

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