2. AIR POLLUTION

3. AIR POLLUTION IS THE ADDITION OF HARMFUL SUBSTANCES IN AIR THAT CAUSES SEVERE DAMAGE TO ENVIRONMENT, HUMAN HEALTH AND QUALITY OF LIFE AIR POLLUTION IS THE ADDITION OF HARMFUL SUBSTANCES IN AIR THAT CAUSES SEVERE DAMAGE TO ENVIRONMENT, HUMAN HEALTH AND QUALITY OF LIFE

4. 1.Autombile Exhaust 2.Industrial Smoke 3.Acid Rain 4.CFC Pollution

6. The rapid and the marked increase in motor vehiclular traffic and its associated gaseous pollutants in the urban areas have caused a sharp increase in the prevalence of respiratory allergies Contribution of motorized traffic to air pollution – total suspended particulate (TSP) dust and automobile exhaust gases, Carbon dioxide, sulphur dioxide, nitrogen dioxide ……………….

8. Figure 18.5 Urban Smog

9. Acid Rain Reactions to convert to acid take place in ~2 days - travel 1000 miles Reactions to convert to acid take place in ~2 days - travel 1000 miles Down wind - Acid rain Down wind - Acid rain Formation of sulphuric acid & nitric acid …….. Formation of sulphuric acid & nitric acid …….. Widespread in N.America,Europe, Japan, South East Asia ……….. Widespread in N.America,Europe, Japan, South East Asia ………..

10. Acid Rain and Trees

12. Ozone Depletion Already we are now getting a "hole" in the ozone layer in polar regions during part of the year. Already we are now getting a "hole" in the ozone layer in polar regions during part of the year. The occurrence of skin cancers has risen by nearly 100% since 1980; this may be due to increased UV radiation reaching earth's surface. The occurrence of skin cancers has risen by nearly 100% since 1980; this may be due to increased UV radiation reaching earth's surface. This is being depleted by several chemicals produced by mankind (various oxides of nitrogen and refrigerants called CFCs). This is being depleted by several chemicals produced by mankind (various oxides of nitrogen and refrigerants called CFCs).

13. Air Pollution Control Early approach: “Dilution is the solution to pollution” Particulate removal - air filters Particulate removal - air filters Sulfur removal - scrubbers Sulfur removal - scrubbers Nitrogen oxide reduction - catalytic converters Nitrogen oxide reduction - catalytic converters Hydrocarbon controls - afterburners Hydrocarbon controls - afterburners 12