EESA10 - Lecture 2.doc

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University of Toronto Scarborough
Environmental Science
Jovan Stefanovic

Lecture 2 Airborne Hazards and Human Health Airborne HazardsToday we will discuss two types of air pollutants1Outdoor air pollution2Indoor air pollutionWhat are the major sources of air pollution They are natural and manufacturedNatural include forest fires volcanoesmost of them that we cannot avoidManufactured has different kinds of industry and the burning of fossil fuelsOutdoor Air PollutionListed are 6 common air pollutantsThey are regulated by the US Actit is called the Clean Air Act of USAA strict threshold is placed on these six pollutantsDiscuss pollutants that are not regulated in Canada or US as they still represent a hazard to human healthOzoneIs a chemical gas that has three oxygen atoms combinedThere are two different types of ozoneOne is good ozoneozone layer in stratosphere protects us from harmful ultraviolet UV radiationThere are ozone holes and problems with the pollution is the good ozone and this ozone is not formed on ground levelIt is formed in the upper level of atmosphereWhat is the subject of concern is the ground level of ozoneozone formed just a little bit above the ground and how this ozone is formedVolatile Organic Compounds VOC react with Nitric Oxides NOx and with some effect of heat and sunlight this is actually photochemical reactionoPhotochemical Reaction is any chemical reaction that is triggered by light sunlightoWhen heat and sunlight has effect on the formation of ozone we can discuss where is the higher risk of being poisoned or having adverse effect of human health on these gasoHot warm sunny climates are a big problem for these types of photochemicals photochemical oxidantsie Mexico CityoWe all know that Mexico City receives a lot of sunshine because of its warmer climateoIn Los Angeles there is also a big problem with photochemical smogIn cold climates the problem is not that it is less significantIn the morning and in the evening the concentration is lowerIn the middle of the day especially around rush hour when traffic is heavy heat is higher and sunshine is combined with pollution thus the concentration of ozone increases significantlyOzone is a summertime pollutant even in Toronto or in Canadacontamination and pollution with the ozone is much higher during the summerOzone is transported over very long distancesit doesnt matter where it is formed can be formed in Asia or Europe but can affect us here in North AmericaWhat does the ozone do to our health to our bodies
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