Smog: I believe you are referring to metabisulfite often used as a preservative. This emits sulfur dioxide which is akin to inhaling an important component of smog leading to asthma attacks for susceptible individuals. The intensity of response varies from person to person.
Answered 3/7/2015
3.1k views
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question