The existence of chemicals, particulates or biologic compounds in the climate can do harm to human and animal physical condition and do harm to the earth. Factories and other industrial establishments have caused such contamination since the beginning of the industrial age by consuming resources, completing chemical processes and discharging dust and various particulates. Air contamination can be controlled through the establishment of filters and scrubbers to clean exhaust fumes from production line processes, and by finding a way to limit the age of contamination at the source.

Energy sources

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Factories need an energy source to control their manufacture processes. In the United States, this has been electricity produced by non-renewable energy source consuming, specifically coal. Air contaminants radiated by coal-fired power plants include nitrogen and sulfur oxides, hydrogen chloride and hydrogen fluoride gases, and arsenic, lead and different metals. Power production for factories may cause more enormous air contamination than the production line processes. Natural gas is the least contaminating fossil fuel for power production. It produces nitrogen oxides and carbon dioxide on consuming, however in far lower amounts than coal.

Metal smelting

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Metals give machine constituents, vehicles, instruments and substructure in factories. Metal smelters that process and refine mineral ores and scrap metal make silica and metallic dusts during the first stage of crushing and grinding. Heating and smelting processes produce outflows of sulfur and carbon oxides. Aluminum smelting can discharge arsenic particulates, while lead and gold refining produces mercury and cyanide outflows.

Petrochemical smog

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Industrial facility processes include fluctuated combinations of cleaning, painting and heating, while other raw material or appliance treatments discharge volatile organic compounds into the climate. These are carbon-or hydrocarbon-based chemicals that rapidly vanish in the air. Within the beam of sunlight, they respond with other air contaminants like sulfur or nitrogen oxides from vehicle exhaust to make peroxyacetyl nitrates, ordinarily known as photochemical smog. This resembles a thick brown fog and can remain for days or weeks over urban centers.

Food processing

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The food processing industry makes use of a wide scope of techniques for the preparation, cooking and bundling of foodstuffs that discharge particulates into the air. Mass material treatment of grains and flour produce dust. Frying and smoking processes discharge ash into the air. Rendering and washing in meat and fish processing plants produces volumes of fluid waste that leaves mold and bacterial deposits that likewise contaminate the air.