Sulfur dioxide is a gas, and have chemical compound with the formula SO ₂. It is invisible and has a nasty, sharp smell. It is a toxic gas responsible for the smell of burnt matches. It is released naturally by volcanic activity and is produced as a by-product of the burning of fossil fuels contaminated with sulfur compounds and copper extraction.
It reacts easily with other substances to form harmful compounds, such as sulfuric acid, sulfurous acid and sulfate particles. About 99% of the sulfur dioxide in air comes from human sources.
SO2 MSDS (material safety data sheet) 
| Sulfur Dioxide | SO2 |
| Molecular Weight (lb/mol) | 64.06 |
| Critical Temp. (°F) | 315.5 |
| Critical Pressure (psia) | 1142.0 |
| Boiling Point (°F) | 14.3 |
| Melting Point (°F) | -103.9 |
| Psat @ 70°F (psia) | 49.3 |
| Liquid Density @ 70°F (lb/ft3) | 85.98 |
| Gas Density @ 70°F 1 atm (lb/ft3) | 0.1682 |
| Specific Volume @ 70°F 1 atm (ft3/lb) | 5.94 |
| Specific Gravity | 2.285 |
| Specific Heat @ 70°F (Btu/lbmol-°F) | 9.58 |
| TLV (TWA) | 2 ppm |
| STEL | 5 ppm |
| IDLH | 100 ppm |
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