Bad air caused by natural phenomenon such as a volcano explosion earthquake a natural occurring radioactive wildfire. Natural gas, etc. Toxicity reasons this article is quite rare because the origin is so far into the environment, of humans and animals have less.
Air pollution caused by natural phenomena such as volcanic eruptions, earthquakes, forest fires, radioactive gas that occurs naturally as toxicity due to this relatively minimal since the distant origins. He enters the environment, human and animal less.
Air pollution caused by natural phenomena, such as volcanic eruptions, earthquakes, forest fire, กัมมัน Trang color that natural gas. Etc. toxicity because of this is very little, because the stem is far.