The World Health Organization defines air pollution as “the presence of materials in the air in such concentration which are harmful to man and his environment.”
Sources of air pollution broadly divided into two subcategories stationary sources and mobile sources, which can be further divided into two sub-categories as below:
i) Line sources: When the emission source is in the form of line or curve e.g. transportation of material by conveyor belts, road rollers and run-off seepage etc.
ii) Area Sources: These sources are mobile but concentrated over a specific area. Examples: airports, railway stations, bus stands and ports.
Major Industry-wise/ Source-wise emission of pollutants :
1 Which of the following are Grossly Polluting Industries?
1. Petro-chemical industry
2. Packaging & printing
4. Textile, Bleaching & Dyeing
a) 1, 2 and 3
b) 2,3 and 4
c) 1, 3 and 4
Exp: Industrial units are classified in following sectors.
• Chemicals: which mainly include fertilizer, petro-chemical , pesticides and pharmaceuticals.
• Dairy, Food & Beverage
• Pulp and Paper Sugar
• Textile, Bleaching & Dyeing
• Other (Cement, Slaughter house, Ordinance, Packaging & printing, Paint, Electronics& Electrical, Thermal, Kattha –kachh, Electroplating, Metallurgical, automobile etc.