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1、PollutionWhenpeoplethinkaboutairpollution,theyusuallythinkaboutsmog,acidrainandotherformsofoutdoorairpollution.Butdidyouknowthatairpollutionalsocanexistinsidehomesandotherbuildings?Everyyear,thehealthofmanypeopleisaffectedbychemicalsubstancespresentintheairwithinbuildings.Outd
2、oorAir PollutionSmogisatypeoflarge-scaleoutdoorpollution.Itiscausedbychemicalreactionsbetweenpollutantsderivedfromdifferentsources,primarilyautomobileexhaustandindustrialemissions.Citiesareoftencentersofthesetypesofactivities,andmanysufferfromtheeffectsofsmog,especiallyduringt
3、hewarmmonthsoftheyear.Foreachcity,theexactcausesofpollutionmaybedifferent.Dependingonthegeographicallocation,temperature,windandweatherfactors,pollutionisdisperseddifferently.However,sometimesthisdoesnothappenandthepollutioncanbuilduptodangerouslevels.Atemperatureinversionoccu
4、rswhenairclosetotheearthiscoolerthantheairaboveit.Undertheseconditionsthepollutioncannotriseandbedispersed.Citiessurroundedbymountainsalsoexperiencetrappingofpollution.Inversioncanhappeninanyseason.Winterinversionsarelikelytocauseparticulateandcarbonmonoxidepollution.Summerinv
5、ersionsaremorelikelytocreatesmog.Anotherconsequenceofoutdoorairpollutionisacidrain.Whenapollutant,suchassulfuricacidcombineswithdropletsofwaterintheair,thewater(orsnow)canbecomeacidified.Theeffectsofacidrainontheenvironmentcanbeveryserious.Itdamagesplantsbydestroyingtheirleave
6、s,itpoisonsthesoil,anditchangesthechemistryoflakesandstreams.Damageduetoacidrainkillstreesandharmsanimals,fish,andotherwildlife.TheGreenhouseEffect,alsoreferredtoasglobalwarming,isgenerallybelievedtocomefromthebuildupofcarbondioxidegasintheatmosphere.Carbondioxideisproducedwhe
7、nfuelsareburned.Plantsconvertcarbondioxidebacktooxygen,butthereleaseofcarbondioxidefromhumanactivitiesishigherthantheworld'splantscanprocess.Thesituationismadeworsesincemanyoftheearth'sforestsarebeingremoved,andplantlifeisbeingdamagedbyacidrain.Thus,theamountofcarbondioxideint
8、heairiscontinuingtoincrease.Thisbuildupactslikeablanketandtra
