An allergic reaction happens when your body attacks a foreign, and typically harmless, substance. Here’s how to tell if ...

This fall, doctors in New England are gaining a better understanding of pollen and other airborne allergies, thanks to a new ...

Scientists clashed with government officials over the true toxicity of the air in the Tijuana River Valley. The public is left to decide what’s real.

Your editors talk about why we love heat pumps. And we try to come up with a better name for this magical heating and cooling device.