Sulfur dioxide ( SO2) is primarily produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores that contain Sulphur. Exposure to SO2 affects the respiratory system and the function of the lungs, and causes irritation of the eyes. Inflammation of the respiratory tract from SO2 can aggravate asthma and chronic bronchitis, as well as increases the risk of infection, leading to increased hospital admissions and visits to emergency rooms. SO2 also combines with water in the air to form sulfuric acid - the main component of acid rain.
730 (0.28) - 365 (0.14) - 80 (0.03) µg/Nm3 (ppm)
1 hour - 24 hour - Annual
|Time –weighted average||Averaging Time||Number of allowable exceedances|
|280 ppb||1-hour||2 times per annum|
|140 ppb||24-hour||1 time per annum|
2 times per annum - 1 time per annum - N/A