On days when wildfire smoke is bad, it looks like Chicago is covered in fog. The iconic city skyline disappears in a hazy sea of grays and blues. It’s hard to even see buildings a couple of blocks ...

A mixture of solid and liquid particles known as particulate matter, or soot, is a common source of air pollution.

Particles in the smoke are so small that they can evade some of the lung’s natural defenses, causing not only breathing problems but also other health concerns if they enter the bloodstream. Smoke ...

Dear Doctors: We live in the fire zone in Altadena, California. After the evacuations ended, we came home, and now my throat is constantly sore. There’s no smoke smell, but my husband says the air can ...

Particle physics describes the universe at the smallest scale. This includes subatomic particles, like protons and neutrons, as well as elementary particles, like quarks and electrons, which make up ...