Class 13b: Air pollutionAir pollutionAir pollutionParticulate matterAcid rainPhotochemial smogOzone layerClass 13b: Air pollution• Particulate matter•Acid rain• Photochemical smog• Ozone and the ozone layerAir pollution• Pollution: concentration of substances that harms living things• Ash, smoke, dust, pollen• Fossil fuels, solvents• 3 million deaths worldwideAir pollution• Physical geography– Prevailing winds– Topography and inversions• Level of urbanization, industrialization• Particulate matter or chemical compoundsParticulate matter• Source: incomplete burning of fuel• Respiratory problems• Short transport distance• Closest to source = most affectedAcid rain• Source: burning fossil fuels• Sulfur from coal becomes sulfuric acid• Terrestrial effects (forests, soils)• Aquatic effects• Material effects (buildings, monuments)Photochemial smog• Sources: incomplete burning of fuel• Nitrogen dioxide, hydrocarbons, and sunlight• Forms ozone at ground level• Respiratory problems, damage to plantsOzone layer• Ozone is necessary at high altitude• Absorbs UV (ultraviolet) radiation• CFCs, other chemicals break down ozone• One of few international success
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