Thick black smoke billowed into the sky, making day seem more like night.

This rain would include acids but also likely many other pollutants harmful to humans and the environment. It may be worse ...

Black acid rain formed after oil depot fires in Tehran may expose millions to acidic aerosols, soot, and toxic pollutants ...

Iran's environmental agency warned people in Tehran to stay indoors. Red Crescent said toxic chemicals in the drizzle could ...

Acid rain is a term that refers to not just rain but also other forms of precipitation such as snow, hail, sleet, and fog that has a higher acidity than normal. Acid rain is caused by the burning of ...

Here’s what you’ll learn when you read this story: While acid rain caused by sulfur dioxide is an environmental threat of the past (at least, for now), a new kind of acid is proliferating in rain ...