1
applies to various gaseous binary chemical compounds formed by the combination of oxygen and nitrogen. the most frequent causes are forest fires, volcanic activity and bacterial decomposition.
2
It is a gas without smell or color but very dangerous. It can suddenly cause illness and death. its chemical formula is CO.
3
It is a colorless and vital gas for life on Earth, but in excess it is polluting. Its chemical formula is CO2
4
It is a colorless, irritating gas with a pungent odor. Its chemical formula is SO2.
5
it is a powerful and aggressive gas that, at high levels, corrodes materials, buildings and living tissues.
6
It is a well-known blue-gray metal, which exists naturally in small quantities in the earth's crust, and can become highly polluting. and its chemical symbol is Pb
