The main cause of particulate matter: essay
The main cause of particulate matter in the air of large cities is man. Thus, particulate matter pollution in large cities is mainly caused by various industrial processes - domyhomework.club , road traffic, and domestic furnaces. In industry, the construction industry raises the most dust (road construction, demolition of buildings, brickworks, cement plants), with bulk handling alone accounting for almost 5% of particulate matter.
Another main source is combustion processes in power plants and industrial facilities Road traffic, on the one hand, raises road dust and, on the other, releases soot particles from diesel vehicles. Diesel consists of higher hydrocarbons than gasoline, so combustion in the diesel engine is not complete, unlike in the gasoline engine - https://domyhomework.club/biology-homework/ . Although road traffic accounts for only 17% of total particulate matter, some newspapers pretend that diesel vehicles are poisoning entire cities. In the case of domestic heating, the bulk of the pollution comes from the few domestic fires fueled by wood or coal, or the fireplaces that have come back into fashion.
The combustion of oil and gas, on the other hand, produces far fewer soot particles. In larger heating systems - https://domyhomework.club/same-day-essay-writing-service/ , these are also usually removed from the exhaust gases. Large quantities of dust can also be generated naturally, for example by soil erosion, pollen, volcanic eruptions, sandstorms in the desert or forest fires. However, this dust rarely reaches urban areas and is therefore hardly noticed in the media. When the natural events mentioned take place near large cities, the direct consequences (deaths, injuries, material damage) are usually the focus of interest.
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