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Air Pollution andGlobal ChangePay close attention to each slide.Click on the speaker on each slide for additional information.
What is Air Pollution Air is a mixture of many gases including: Nitrogen,Oxygen, Carbon Dioxide, Water Vapor and traceother gases. Any change in the atmosphere that has harmfuleffects is called air pollution Any substance that causes pollution is called apollutant
Composition of the AirFrom the pie chart you can seeNitrogen actually makes up thegreatest percentage of gas in theair…most would think it wouldbe oxygen because that is whatwe breathe.Image:http://id.wikipedia.org/wiki/Berkas:Air_composition_pie_chart.JPG
How does pollution makeit into the Air? Solid particles and gasesthat are released intothe air are calledemissions Main cause of emissionsis by motor vehiclesreleasing carbonmonoxide into the airImage: Epa.gov
Smoke + Fog = Smog When certain gases in the air react with sunlight itcan create a think brownish haze calledphotochemical smog When the smog level is high it can settle over a citycreating a dirty haze Potential threats to humans are breathing trouble,throat irritation and burning eyes Major sources of smog are the gases emitted byvehicles
Smog continued…Images ofBeijing, Chinaon a clear sunnyday and thencovered in Smog(August 2005Smog over Los AngelesImages: http://www.earthlyissues.com
Acid Rain Acid rain is another type of air pollution It is caused by power plants and factories that burncoal and oil and release chemicals into the air These gases react with water vapor in theatmosphere forming acids which return to Earth’ssurface in the form of precipitation Acid rain affects many things in the environmentincluding: fish, plants, buildings, statues, etc…
Acid rain Continued…Here you can see the effects of acid rain trees and limestoneImages: USGS.gov
Not all pollution is outside The air inside buildings can be polluted too= indoor airpollution Dust, pet hair, air fresheners, smoke and toxic fumesfrom cleaning supplies can all contribute to air pollution Carbon Monoxide (CO) is an indoor air pollutant that isa colorless and odorless gas that forms when wood, coal,oil or gas is not completely burned Radon is another colorless and odorless gas formednaturally by certain rocks underground that isradioactive.
Common Types of IndoorAir PollutionImage:http://www.epa.gov/eogapti1/course422/ap4.html
Human Impact onEnvironment Humans are the leading factor in creating airpollution and other hazardous wastes on earth Humans contribute to deforestation (cutting downtrees which produce oxygen) Humans also effect the natural process on earthcalled The Greenhouse effect Hazardous waste is any material that can beharmful to human health or the environment if notproperly disposed of
Greenhouse Effect Greenhouse gases trap heat in the air which aids inkeep the earth a suitable temperature for us tosurvive Humans add greenhouse gases to the atmospherethrough everyday activities including driving andburning fossil fuels The more greenhouse gases that are trapped in theatmosphere the more likely it is for our overalltemperature of earth to increase (global warming)
The Greenhouse Effect Image: http://www.nps.gov/goga/naturescience/climate-change-causes.htm
5 Categories of HazardousWaste1. Toxic waste= or poisonous wastes are wastes that candamage health of humans or other organisms2. Explosive wastes= wastes that react very quickly whenexposed to the air or water or that explode when theyare dropped3. Flammable wastes= catch fire easily and can beginburning at fairly low temperatures4. Corrosive wastes= wastes that dissolve or eat throughmany materials5. Radioactive wastes= contain unstable atoms that giveoff radiation that can cause cancer and other diseases
Health Effects ofHazardous Wastes Short term exposure to hazardous wastes may causeirritation to certain body parts or more severe healthproblems Long term exposure may cause diseases such ascancer and may damage body organs including: thebrain, liver, kidneys and lungs
Getting Rid ofHazardous Wastes Methods of hazardous waste disposal include burial inlandfills, incineration and breakdown by living organisms Liquid wastes can be stored in deep rock layers Most often Hazardous wastes are disposed in carefullydesigned landfills These landfills are lined with clay and plastic to keepchemicals from seeping into the soil and groundwater (whichcould cause serious contamination and health problems) The best way to manage hazardous waste is to produce less ofthem and educate consumers on finding substitutes forcommon household chemicals
Disposing of HazardousMaterials ProperlyImage: Epa.gov