Teachers students:

hello everybody

Today I lecture on the topic of air pollution. Air pollution is a new branch of atmospheric science it is to study in different weather conditions into the atmosphere of the pollutants in the atmosphere transmission dilute diffusion transformation and remove the rule and application of science. This subject originated from the 20XX s 20 xx years British atmospheric diffusion experiment was carried out but only in the '50 s the development of modern industry and city population is highly concentrated there appeared the serious urban or industrial pollution events in December 20 xx's London smog event for example took the lives of more than four thousand people these make people wide attention and research of atmospheric pollution to the 60 s then gradually formed this new independent discipline.

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Air pollution due to human activity or natural process and out into the atmosphere into some harmful substances (pollutants) when the amount of discharged into enough (pollutant concentration up to a limit) makes the original clean air quality to drop if this situation is maintained long enough will be to humans animals plants and the atmosphere cause harm and adverse effects of the atmospheric state known as air pollution. Of air pollution has three elements: the concentration of pollution sources and pollutants harm to human and biological.

Clean the atmosphere is one of the necessary conditions for the survival of humans in one person in five weeks no eating or five days without drinking water to be able to sustain life but not breathing air for more than 5 minutes then die the body to absorb every day 10-12 cubic meter of air. Thus eliminating air pollution or keep pollution concentration falls below a certain limit is how important.

Pollution sources and pollutants discharged into the source of harmful substances into the atmosphere pollution sources harmful substances into the atmosphere pollutants. Atmospheric pollution source points of artificial and natural sources

The harm of air pollution and influence

Atmospheric pollution on human and environment caused by the harm and influence has gradually been recognized in the aggregate has the following several aspects:

(1) the harm to human health. Human suffering has three pollute the air surface skin contact with the air inhaled and eating food containing atmospheric pollutants besides can cause respiratory and lung diseases but also on the cardiovascular system liver etc serious can take away the life.

(2) the harm of biological. Animals because of the inhaled air pollution or eat foods containing contaminants and disease or death atmospheric pollutants can make the plant disease resistance drop influence the growth leaf spot wither or die.

(3) the harm of items. Such as the textile clothing leather metal products construction materials culture art etc. chemical damage and defiled damage.

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(4) cause acidic precipitation such as agriculture forestry fresh water aquaculture.

(5) destroys the high-altitude ozone layer ozone hole formation cause harm to human and biological survival environment.

6. Impact on the global climate such as the increase in carbon dioxide and other greenhouse gases will cause the earth's atmosphere warms lead to increased global weather disasters and aerosol particles such as smoke increase the atmospheric turbidity solar radiation affect the longwave radiation the earth may lead to abnormal weather climate.

How to prevention and control of atmospheric pollution reduce the harm of air pollution and influence constitute a major and urgent research subject. Prevention and control of atmospheric pollution

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Prevention and control of atmospheric pollution is a huge system engineering need to be individual and collective national and the joint efforts of the world can consider to take measures in the following aspects:

(1) to reduce emissions. Use more pollution-free energy (such as solar energy wind energy hydroelectric power) reform the energy structure with low pollution energy (such as natural gas) pretreatment of fuel (such as coal desulfurization) before such as improving combustion technology can reduce emissions. In addition before the pollutants into the atmosphere not use dust smoke abatement technology condensing technology liquid absorption technology recycling technology to eliminate some pollutants in the exhaust and can reduce the amount of pollutants into the atmosphere.

(2) to curb emissions and make full use of atmospheric self-purification ability. Different meteorological conditions the capacity of the atmospheric pollutants into the same amount of pollutants the pollutant concentration was different. For wind good ventilation turbulence strong convection area and time atmospheric diffusion dilution ability is strong can accept more corporations to inversion region and time atmospheric diffusion dilution ability is weak cannot accept more pollutants otherwise it will cause serious air pollution. Therefore respond to different regions different times for the effective control of emissions.

(3) site selection design of chimney urban and industrial planning should be reasonable don't emitters transition concentration repeated superposition don't cause pollution formation of local serious pollution incident.

(4) greening afforestation make more plants absorb pollutants reduce atmospheric pollution.

Through the above explanation we know the importance of air for our human right from now on please protect the environment afforestation and create a better living environment!

Today my speech is that under the flag of thank you.