Air Pollution Checked by Petrova N. N. Done by George Mosunov 8 «A» school 73 Lira

Litter ► Every day, the average person inhales about 20,000 liters of air. Every time we breathe, we risk inhaling dangerous chemicals that have found their way into the air.

► Air pollution includes all contaminants found in the atmosphere. These dangerous substances can be either in the form of gases or particles. ► Air pollution can be found both outdoors and indoors. Pollutants can be trapped inside buildings, causing indoor pollution that lasts for a long time.

How does air pollution form? ► Air pollution can form in various ways. Chemicals are emitted during many different human activities. In the atmosphere these chemicals can react with other chemicals to more dangerous substances. Air pollutants often have properties that are harmful to the environment. The weather plays an important role in the formation and disappearance of air pollution. This is mainly influenced by wind and temperatures. Air pollutants can be transported by wind, causing a pollution to spread widely. Rain can remove pollutants from air, causing soil and water pollution. Sunlight can aid the convertion of air pollutants to different substances.

► - Biological air pollution, such as pollens, small insects and microorganisms (bacteria, fungi, yeasts and algae) - Physical air pollution, such as sound, smell, thermal pollution and radioactive radiation - Chemical air pollution, such as ozone, aerosols and ammonia

How does air pollution spread and how can we handle this? ► The dispersion of air pollutants mainly depends on physical processes is air; those of wind and weather. How far air pollutants are transported mainly depends upon particle size of the compounds and at which height the pollution was emitted into the air. Fumes that are emitted into air through high smoke stags will mix with air so that local concentrations are not very high. However, wind will transport compounds and the pollution will become very disperse. Rain can remove pollutants from air. This causes precipitation and consequentially soil and water pollution. For environmental agencies it is very important to determine exactly how an air pollutant spreads. Air is not a very complex medium. This enables us to predict the dispersion of air pollutants with computer models. In a computer model dispersion is calculated by means of different parameters, such as wind speed, wind direction, temperature, air humidity and cloudiness. These predictions are of great significance when we are dealing with toxic clouds or radioactive radiation, because these are a danger to human health and because inhabitants of polluted areas need to be warned.