Human Health and the Environment 2 - Human Health and the...

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Human Health and the Environment Lecture 2: Airborne Hazards and Human Health Announcements The final is going to be cumulative. Professor does not yet know of the midterm date. She will post it on the intranet as soon as she gets information on it. The midterm examination will most likely be after the reading week but not 100% guaranteed. The professor’s new office hours are 4PM-6PM Wednesday before lecture in SW410. Change in Teaching Assistant Wing-Shun Wu for P-Z online lecture (LEC 60) Office Hours Friday 12PM-2PM Announcement on Readings Book and presentations are enough for the exams Only the topics that the professor covers in class look through the text, otherwise there is nothing additional Airborne Hazards Today we will discuss two types of air pollutants 1) Outdoor air pollution 2) Indoor air pollution What are the major sources of air pollution? They are natural and manufactured Natural include forest fires, volcanoes – most of them that we cannot avoid Manufactured has different kinds of industry and the burning of fossil fuels Outdoor Air Pollution Listed are 6 common air pollutants They are regulated by the U.S. Act – it is called the Clean Air Act of U.S.A. A strict threshold is placed on these six pollutants Discuss pollutants that are not regulated in Canada or U.S. as they still represent a hazard to human health Ozone Is a chemical gas that has three oxygen atoms combined There are two different types of ozone One is good ozone – ozone layer in stratosphere protects us from harmful ultraviolet (UV) radiation There are ozone holes and problems with the pollution (is the good ozone) and this ozone is not formed on ground level It is formed in the upper level of atmosphere What is the subject of concern is the ground level of ozone – ozone formed just a little bit above the ground and how this ozone is formed Volatile Organic Compounds (VOC) react with Nitric Oxides (NOx) and with some effect of heat and sunlight (this is actually photochemical reaction) Photochemical Reaction is any chemical reaction that is triggered by light, sunlight When 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 gas Life Support EESA10H3 S
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Hot, warm, sunny climates are a big problem for these types of photochemicals, photochemical oxidants – i.e. Mexico City We all know that Mexico City receives a lot of sunshine because of its warmer climate In Los Angeles there is also a big problem with photochemical smog In cold climates the problem is not that, it is less significant In the morning and in the evening the concentration is lower In 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 significantly Ozone is a summertime pollutant even in Toronto or in Canada – contamination and
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This note was uploaded on 04/09/2011 for the course ENVIRONMEN EESA10 taught by Professor Silvajastovenovij during the Spring '11 term at University of Toronto- Toronto.

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Human Health and the Environment 2 - Human Health and the...

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