The Midwest saw some of the worst air quality conditions in the world Thursday, and similar conditions are expected to persist for several days.

Physicists have used a machine-learning method to identify surprising new twists on the non-reciprocal forces governing a many-body system.

"The health cost is but one of many." Experts sound the alarm on invisible threat costing Americans billions: 'The downside ... [is] significant' first appeared on The Cool Down.

Air pollution is less dramatic than floods or storms, less inconvenient, and much harder to politicize. It’s also much more ...