Comparison of environment and air pollution in big cities

Air pollution is the presence of undesirable substances in the air in an amount that can cause harmful effects. Although normally only the adverse effects on humans are considered, this definition does not limit air pollution to these effects only. Adverse substances can affect humans and plants, materials and objects, or the global environment, or create inappropriate effects by fogging the air and creating unpleasant odors. Many of these harmful substances enter the atmosphere in a suitable way that is currently not under human control, at the same time, in most areas with high population density, especially industrialized countries, the main source of these pollutants is human activities. So that today the intensity of pollution has reached a level at the global level, which can potentially be critical for the earth. Accidents caused by air pollution, such as the London accident that killed more than ۴,۰۰۰ people in London in ۱۹۵۲ due to photochemical smog, global warming, destruction of the ozone layer, acid rain, severe climate change and many other effects. , is the result of pollution entering the atmosphere. which threatens the life of creatures more than before. Therefore, more serious and practical decisions should be taken regarding the reduction and control of pollutants.

کلیدواژه ها:

pollution ، air ، environment