Air Pollution G Tyler Millers Living in the
- Slides: 19
Air Pollution G. Tyler Miller’s Living in the Environment 14 th Edition Chapter 20
Key Concepts Ø Structure and composition of the atmosphere Ø Types and sources of outdoor air pollution Ø Types, formation, and effects of smog Ø Sources and effects of acid deposition Ø Effects of air pollution Ø Prevention and control of air pollution
The Atmosphere Ø Troposphere Ø 78% N, 21% O Ø Stratosphere Ø Ozone layer Ozone – Double Trouble Fig. 20 -2 p. 434
Outdoor Air Pollution Ø Primary pollutants Ø Secondary pollutants
Table 20 -1 Major Classes of Air Pollutants Class Examples Carbon oxides Carbon monoxide (CO) and carbon dioxide (CO 2) Sulfur oxides Sulfur dioxide (SO 2) and sulfur trioxide (SO 3) Nitrogen oxides Nitric oxide (NO), nitrogen dioxide (NO 2), nitrous oxide (N 2 O) (NO and NO 2 often are lumped together and labeled NOx) Volatile organic compounds (VOCs) Methane (CH 4), propane (C 3 H 8), chlorofluorocarbons (CFCs) Suspended particulate matter (SPM) Solid particles (dust, soot, asbestos, lead, nitrate, and sulfate salts), liquid droplets (sulfuric acid, PCBs, dioxins, and pesticides) Photochemical oxidants Ozone (O 3), peroxyacyl nitrates (PANs), hydrogen peroxide (H 2 O 2), aldehydes Radioactive substances Radon-222, iodine-131, strontium-90, plutonium-239 (Table 3 -1, p. 49) Carbon tetrachloride (CCl 4), methyl chloride (CH 3 Cl), Hazardous air pollutants (HAPs), which cause health effects such as cancer, birth chloroform (CHCl 3), benzene (C 6 H 6), ethylene dibromide (C 2 H 2 Br 2), formaldehyde (CH 2 O 2) defects, and nervous system problems
Table 20 -2 Major Outdoor Air Pollutants CARBON MONOXIDE (CO) NITROGEN DIOXIDE (NO 2) Description: Colorless, odorless gas that is poisonous to air-breathing animals; forms during the incomplete combustion of carboncontaining fuels (2 C + O 2 2 CO). Description: Reddish-brown irritating gas that gives photochemical smog its brownish color; in the atmosphere can be converted to nitric acid (HNO 3), a major component of acid deposition. Major human sources: Cigarette smoking (p. 409), incomplete burning of fossil fuels. About 77% (95% in cities) comes from motor vehicle exhaust. Health effects: Reacts with hemoglobin in red blood cells and reduces the ability of blood to bring oxygen to body cells and tissues. This impairs perception and thinking; slows reflexes; causes headaches, drowsiness, dizziness, and nausea; can trigger heart attacks and angina; damages the development of fetuses and young children; and aggravates chronic bronchitis, emphysema, and anemia. At high levels it causes collapse, coma, irreversible brain cell damage, and death. Major human sources: Fossil fuel burning in motor vehicles (49%) and power and industrial plants (49%). Health effects: Lung irritation and damage; aggravates asthma and chronic bronchitis; increases susceptibility to respiratory infections such as the flu and common colds (especially in young children and older adults).
Photochemical Smog Ø Photochemical reaction Ø Photochemical oxidants Ø Brown-air smog
Industrial Smog Ø Particulates Ø Sulfur dioxide Ø Sulfuric acid Ø Gray-air smog
Temperature Inversions Ø Subsidence inversion
Regional Outdoor Air Pollution from Acid Deposition Eastern United States Czech Republic Ø Acid deposition Ø Wet deposition Ø Dry deposition
Acid Deposition and Humans Ø Respiratory diseases Ø Damage to structures, especially containing calcium carbonate Ø Toxic metal leaching Ø Decreased visibility Ø Decreased productivity and profitability of fisheries, forests, and farms
Acid Deposition, Plants, and Soil Acid Deposition and Aquatic Systems Ø Nutrient leaching Ø Fish declines Ø Heavy metal release Ø Aluminum toxicity Ø Weakens trees Ø Acid shock
Solutions to Acid Deposition CBS - China’s Air Pollution Problem
Effects of Air Pollution on People Ø Respiratory diseases (see Fig. 20 -15 p. 452) Ø Asthma Ø Lung cancer Ø Chronic bronchitis Ø Emphysema Ø Premature death Solutions: Preventing and Reducing Air Pollution Ø Clean Air Act Ø National Ambient Air Quality Standards (NAAQS) Ø Primary and secondary standards Ø Emissions trading
Emission Reduction
Reducing Motor Vehicle Air Pollution In the Energy Policy and Conservation Act of 1975, the Department of Transportation (DOTS) was given the authority to set what's called Corporate Average Fuel Economy (CAFE) for motor vehicles. CAFE was intended to reduce both fuel consumption and emissions (not surprisingly, because burning less gas creates less air pollution). The standard today requires that vehicles have a fuel efficiency average of 27. 5 miles per gallon, but larger vehicles such as pick-up trucks, SUVs, and minivans have a lower standard, of just 20. 7 mpg. However, due to the increasing dominance of SUVs and minivans in the U. S. market, Congress has allowed DOT to raise the standard for light trucks to 22. 7 mpg by the year 2007.
Indoor Air Pollution 60 Minutes – Indoor Air Quality Sick Building Syndrome Indoor Air pollution - causes an pollutants Asbestos Radon Ø Radioactive radon-222 Ø Lung cancer threat Ø Occurs in certain areas based on geology Ø Associated with uranium and organic material in rock
Reducing Indoor Air Pollution
- Chapter 12 air section 1 what causes air pollution
- Chapter 12 air section 1 what causes air pollution
- Pt tanah air sentosa
- Mount classification of dental caries
- Right angle technique for object localization
- Arthur millers drama fra 1953
- Robin hood's merry men
- Millers pyramid
- Millers mobility classification
- Liquefaction foci dentin
- Millers emerald
- Zones of dentinal caries
- Smallest living unit
- Living non living dead
- Ecosystem living and nonliving things
- Is a candle living or nonliving
- Erg (air pollution control) ltd
- Air pollution
- Section 2 air noise and light pollution
- Air pollution aim