الفهرس 
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Abstract
Air Pollution is defined as ’’any substances emitted to the atmosphere naturally or anthropogenic in high concentrations enough to be harmful to humans, animals, vegetation or materials” (Rani et al., 2011).
1.1. Impacts of Air Pollution
Air pollutants, consisting of carbon monoxide (CO), sulfur dioxide (SO2), nitrogen oxides (NOx), volatile organic compounds (VOCs), ozone (O3), heavy metals, and respirable particulate matter (PM2.5 and PM 10), differ in their chemical composition, reaction properties, emission, time of disintegration and capability to diffuse in long or short distances. Air pollution has both acute and persistent consequences on human health, affecting some of special structures and organs. It degrees from minor top respiratory irritation to persistent respiratory and coronary heart disease, lung cancer, acute respiratory infections in youngsters and chronic bronchitis in adults, disturbing pre-present coronary heart and lung disease, or asthmatic attacks. In addition, quick- and lengthy-term exposures have also been connected with premature mortality and reduced life expectancy (Kampa & Castanas, 2008).
Moreover, the Global Burden of Disease Study showed that air pollutants were responsible for more than 1.2 million premature deaths in China in 2010 (Yin et al., 2017).
1.2 Sulfur Dioxide, Nitrogen Oxides, Carbon Monoxide Definitions and sources
1.2.1 Sulfur Dioxide
Sulfur dioxide (SO2), is one amongst the foremost common air pollutants and a significant concern in pollution management acts. (Gauderman et al., 2000).
Sources of sulfur dioxide: Sulfur dioxide comes from herbal assets including decaying rely and volcanic eruptions; however, plenty of the sulfur is emitted from anthropogenic sources (Luvsan et al., 2012). SO2 is principally created by combustion of sulfur-bearing fossil fuels applied for thermal power generation, heating, cooking, and transportation, Oil refineries and ore smelters are further sources (Onursal & Gautam, 1997).
1.2.2 Nitrogen Oxides
Nitrogen oxides (NOx) are produced in combustion techniques, in part from nitrogen compounds inside the fuel, however usually by using direct aggregate of atmospheric oxygen and nitrogen in flames. Nitrogen oxides are produced evidently through lightning, and also, to a tiny extent, via microbial procedures in soils.
Sources of Nitrogen Oxides: Man-made emissions of nitrogen oxides dominate overall emissions in Europe, with the United Kingdom emitting about 2.2 million tons of NO2 each year. Of this, about one-quarter is from strength stations, one-half of from motor vehicles, and the relaxation from other industrial and domestic combustion processes. Unlike emissions of sulfur dioxide, emissions of nitrogen oxides are only falling slowly inside the