Outdoor Air Pollution. Primary vs. Secondary Air Pollutants

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1 Air Pollution

2 Outdoor Air Pollution Primary vs. Secondary Air Pollutants Primary Pollutant a pollutant that is put directly into the air by human activity. Examples: CO, NOx, PM, SOx, VOCs Sources: Electricity Production, Industry, Transportation, Other Sources Secondary Pollutant when primary pollutants react with other primary pollutants or natural substances to form a new pollutant. Example: Ground-level ozone

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4 Motor Vehicle Emissions FACTS: Almost 1/3 of our air pollution comes from gasoline burned by vehicles. The Clean Air Act - passed in 1970 (amended in 1990) gives the EPA the authority to regulate vehicle emissions EPA required the gradual elimination of lead in gasoline lead pollution has dropped more than 90% in the United States. Catalytic Converters now required in all vehicles clean exhaust gases of pollutants before the exhaust leaves the tail pipe. Cars and trucks today burn fuel 35% more efficiently and with 95% fewer emissions of pollutants than they did 30 years ago.

5 Types of Air Pollutants

6 Pollution Sources in the United States Types of Air Pollution in the United States Mobile and stationary sources

7 Outdoor Air Pollution Industrial Smog Primary air pollutants from burning fossil fuels

8 Photochemical Smog Primary & Secondary air pollutants that hang over urban areas and reduce visibility. From vehicles & industry.

9 Smoggy day

10 Increasing altitude Warmer air Inversion layer Cool layer Mountain Mountain Valley Decreasing temperature Temperature Inversion causes pollution to get trapped near the ground.

11 Increasing altitude Descending warm air mass Inversion layer Sea breeze Mountain range Decreasing temperature

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13 Los Angeles Mexico City

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15 Regulations Scrubbers - machines that remove pollutants from exhaust by spraying gases with water. Electrostatic Precipitators machines that remove dust particles from smoke stacks by electrically charging the dust particles, causing them to stick to each other & the chamber.

16 Effects of Air Pollution Short Term headache, nausea, irritation, cough, infections Long Term asthma, emphysema, lung cancer, heart disease

17 Chloroform Para-dichlorobenzene Tetrachloroethylene 1, 1, 1- Trichloroethane Formaldehyde Nitrogen Oxides Benzo-a-pyrene Styrene Asbestos Tobacco Smoke Carbon Monoxide Methylene Chloride Radon-222 Indoor Air Pollution

18 Air quality indoors is often much worse than air quality outside Most Common Indoor Air Pollutants Radon Cigarette Smoke Carbon Monoxide Nitrogen Dioxide Formaldehyde Household Pesticides Lead Household cleaners Ozone Asbestos

19 Viruses Bacteria Fungi yeasts molds mildews Dust Mites Pollen

20 Sick Building Syndrome Sick-Building Syndrome Tightly sealed buildings often lead to the people who are inside showing symptoms of allergic reactions. Symptoms: eye or skin irritations, allergic reactions, nausea, asthma, headaches, respiratory infections, depression, and fatigue. Medical costs ~ $ 1 Billion / year Overall costs ~ $ 50 Billion / year

21 Indoor Air Pollution and the Asthma Epidemic # of asthma sufferers has doubled since 1970 Exactly why is unknown, but thought to be linked to increased indoor air pollution

22 Outlet vents for furnaces and dryers Openings around pipes Open window Cracks in wall Slab joints Wood stove Furnace Clothes dryer Cracks in floor Slab Radon-222 gas Sump pump Uranium-238 Radium-222 Soil Radon

23 Radon Gas Radioactive gas Produced by the decay of uranium in Earth s crust Colorless & odorless. 2 nd leading cause of lung cancer in U.S.

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25 The Reading Prong Radon in North Carolina Radon Gas Radioactive gas that is Zone 1 Highest Potential (greater than 4 pci/l) produced by the decay of uranium in Zone 2 Moderate Potential (from 2 to 4 pci/l) Earth s crust. Colorless & odorless. 2 nd leading cause of lung cancer in U.S. Zone 3 Low Potential (less than 2 pci/l)

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27 Asbestos mineral whose fibers are valued for their strength and resistance to heat. - Used as insulator and fire retardant. - Fibers lodge in lungs and cause mesothelioma.

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