Clear and Detailed, Lec 2

4 Pages

Environmental Science
Course Code
Jovan Stefanovic

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EESA10 Lecture 2: Outdoor Air Quality: 6 common Air Pollutants Quality of air is judged based upon these pollutants. They are measured everyday so we can calculate air quality. Ozone Ozone is made up of 3 oxygen molecules. It can be pollutant if above ground level, but can also have great affect on ozone layer in the stratosphere. It will protect us from UV radiation. Good ozone is in stratosphere while bad ozone is the one at ground level. Ozone is formed during summertime. Why? bc in chemical formation of ozone sunlight and heat have played significant roles, what happens? Volatile organic compounds that evaporate at room temp, they react with N oxides, with affect of heat and sunlight, they produce ozone. T This happens during summer time bc higher heat and sun. Also effected by time of day bc in the morning there is less heat and sunshine, but during afternoon more ozone produced due to higher temp and sunlight. This phenomenon is seasonal. Much of it is in California, but still lots in Toronto during JulyAugust. Ozone has ability to transvert on very long distances. It travels very far and doesnt only affect one area. How does ozone harm our body? Ozone can damage lungs (SMALL AIRWAYS) bc ozone is not very much dissolved in water and when it comes into our airways it doesnt dissolve in the upper levels of our airways, it travels further into our lungs and damages it. Symptoms are shortness of breath, chest tightness, coughingnausea, can irritate eyesnosesinesisthroat. Ppl who are considered healthy experience high harm due to ozone bc their outside and exercising and breathing more air. Particulate matter Liquid particles and solid particles, These particles can be produced due to combustion processes (burning). Also produced in air by rxn of solid particles and water. Or soln or water vapor in air. Dustsmoke liquid droplets found in air. They can be very, very tiny. How much harm they cause depends on size. Particles smaller than 2.5 micrones are harmful bc that size can reach lower levels of our lungs and further into them. These are created thru vehicles, crashing, burning, construction. Carbon Monoxide When anything is burning, it produced carbon monoxide. How harmful is it? (look at USA stat).
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