Carbon monoxide (CO) is an odorless, colorless gas that kills without warning. According to the Centers for Disease Control and Prevention, more than 400 people die from CO poisoning every year.

Residents in Astrakhan have complained about the smell after a reported Ukrainian drone strike on a natural gas facility.

Carbon monoxide (CO) is an odorless, colorless gas that can cause sudden illness or death. Symptoms, often mistaken for the ...