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City of toxic particulate matter sources:
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The first: is automobile exhaust. The large vehicle use diesel is PM10 emissions "repeat", including the big bus, each unit of the train, and large transport trucks. City of toxic particulate matter sources: the first is the automobile tail gas. Emissions of fine particles aggregated consequential offense "is the use of diesel car". Small cars use gasoline while emissions are gaseous pollutants, such as nitrogen oxides, but with fog, is also very easy to translate into two particulate pollutants, aggravate the haze.
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Motor vehicle exhaust is the haze particles composed of the main components, the latest data show,Beijing haze particles in tail gas of motor vehicles accounted for 22.2%, coal accounted for 16.7%,dust accounted for 16.3%, industry accounted for 15.7%. But with the progress of automobile technology and rising the quality of oil products, environmental managers found that motor vehicle exhaust does not play a decisive role on the formation of haze weather, but as some of the larger citycar ownership, managers still need to control vehicle emissions standards, avoid the formation of hazeweather.
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Second: North to the exhaust gas produced by the burning of coal for heating in winter.
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Third: emissions from industrial production. Such as metallurgy, furnace and boiler, electrical and mechanical manufacturing industry, there are a large number of auto repair paint, building materials production furnace combustion emissions.
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Fourth: the construction sites and road traffic caused by dust.
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Fifth: the growth of particles, bacteria and virus particle size is equivalent to PM0.1-PM2.5, the humidity in the air and the temperature is proper, microbial attachment to particles, especiallyparticulate fume, microbial absorption oil drop into the more microbes, which makes the toxic substances haze growth.
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Sixth, the family decoration will produce dust "haze", indoor dust, not only harmful to health workers and users, add clean dust burden, serious when, also bring a lot of hidden decoration engineering. [4][5]
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Besides the meteorological conditions, industrial production, motor vehicle exhaust emissions, the winter heating coal burning caused by particles in the atmosphere (including PM10 coarse particles and fine particles PM2.5) concentration increased, is an important factor of haze generated. Now many city level of emissions of pollutants have been at a critical point, is very sensitive to weather conditions, air quality in the diffusion condition can meet the standard, once encountered adverse weather conditions, air quality and visibility will immediately fall.
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