Fires are another main source of air pollution and may lead to danger problems if the smoke is inhaled for a period of time. These fires may either be forest fires, oil well fires, burning of leaves in the yard or as in the case of rural areas, large-scale burning of agricultural waste, Other sources involve industries and power plants at these areas Table (1) (epa.gov, 2013).
1.3.4. Impact of air pollution on health
The quantity of the London fog in1952, which influenced such a large number of people, due to the SPM levels which result from industrialation increased manifold and resulted in over 4000 deaths.
Indoor air pollution may be hazardous to health as it is released in close to people. Indoors pollutant is many times more likely to reach the lung than that released outdoors. In the developing countries a large portion of the population is dependent on biomass for their energy requirements; using wood, charcoal, agricultural residue, and animal waste. The stove is often at floor level, also the risk of accident and the hygiene factor, they are usually not attached a chimney to remove the pollutants .The major pollutant in this environment is the SPM. Generally, death due to indoor air pollution, mainly particulate matters, in the rural areas of India is one of the highest in the world. The deaths often are due to acute respiratory infections in children; others are due to cardiovascular diseases, lung cancer, and chronic respiratory diseases in adults. (Meilu et al .2015),
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1.3.4.1. Health impact of specific air pollutants
The gases mentioned below are often outdoor air pollutants but some of them may and do occur indoor depending on the circumstances.
Tobacco smoke; its smoke generates a range of harmful chemicals. It is cause cancer, not only for the smoker but affecting passive smokers also, and throat irritation, bronchitis, severe asthma, and a decrease in respiratory system