Particle

Wildfire Smoke Has Exposed Millions To Hazardous Pollution Levels: AP Analysis

What makes the smoke from these fires dangerous are particles too small for the naked eye to see that can be breathed in and cause respiratory problems.
By Matthew Brown and Camille Fassett, AP

Swiss Town Coated In Cocoa Powder After Factory Glitch

It snowed particles of fine powder in Olten after the ventilation system at the Lindt & Spruengli chocolate factory malfunctioned.
By AP