Formaldehide
Formaldehide (CH2O) is a colorless gas that have pungent odor. Commercial solutions of formaldehyde in water, commonly called formalin, were formerly used as disinfectants and for preservation of biological specimens ( en.wikipedia.org ). Commonly formaldehide formed from reaction catalitic oxidation from metanol. So every day it formed from burned of cigaret, fuel and our woods. Our cell body also produce it as a metabolic product. In our athmosphere it can be produce as interaction betwen sun light and O2 with metana or other hidrocarbon. Even in small amount formaldehide can cause seriously health problem. Symptoms of low-level exposure include; runny nose, sore throat, cough, dermatitis, sleeping difficulties, headache, fatigue, breathing difficulties, sinus irritation, chest pain, frequent nausea, bronchitis, and decreased lung capacity. Signs of acute exposure include; abdominal pain, anxiety, coma, convulsions, diarrhea, and respiratory prob...