Atmospheric Pollution · ⁨大気汚染⁩

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.A: Identify the sources and effects of air pollutants.

• STB-2.A.1 Coal combustion releases air pollutants including carbon dioxide, sulfur dioxide, toxic metals, and particulates.
• STB-2.A.2 The combustion of fossil fuels releases nitrogen oxides into the atmosphere. They lead to the production of ozone, formation of photochemical smog, and convert to nitric acid in the atmosphere, causing acid rain. Other pollutants produced by fossil fuel combustion include carbon monoxide, hydrocarbons, and particulate matter.
• STB-2.A.3 Air quality can be affected through the release of sulfur dioxide during the burning of fossil fuels, mainly diesel fuels.
• STB-2.A.4 Through the Clean Air Act, the Environmental Protection Agency (EPA) regulated the use of lead, particularly in fuels, which dramatically decreased the amount of lead in the atmosphere.
• STB-2.A.5 Air pollutants can be primary or secondary pollutants.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.B: Explain the causes and effects of photochemical smog and methods to reduce it.

• STB-2.B.1 Photochemical smog is formed when nitrogen oxides and volatile organic hydrocarbons react with heat and sunlight to produce a variety of pollutants.
• STB-2.B.2 Many environmental factors affect the formation of photochemical smog.
• STB-2.B.3 Nitrogen oxide is produced early in the day. Ozone concentrations peak in the afternoon and are higher in the summer because ozone is produced by chemical reactions between oxygen and sunlight.
• STB-2.B.4 Volatile Organic Compounds (VOCs), such as formaldehyde and gasoline, evaporate or sublimate at room temperature. Trees are a natural source of VOCs.
• STB-2.B.5 Photochemical smog often forms in urban areas because of the large number of motor vehicles there.
• STB-2.B.6 Photochemical smog can be reduced through the reduction of nitrogen oxide and VOCs.
• STB-2.B.7 Photochemical smog can harm human health in several ways, including causing respiratory problems and eye irritation.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.C: Describe thermal inversion and its relationship with pollution.

• STB-2.C.1 During a thermal inversion, the normal temperature gradient in the atmosphere is altered as the air temperature at the Earth's surface is cooler than the air at higher altitudes.
• STB-2.C.2 Thermal inversion traps pollution close to the ground, especially smog and particulates.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.D: Describe natural sources of $CO_2$ and particulates.

• STB-2.D.1 $CO_2$ appears naturally in the atmosphere from sources such as respiration, decomposition, and volcanic eruptions.
• STB-2.D.2 There are a variety of natural sources of particulate matter.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.G: Explain how air pollutants can be reduced at the source.

• STB-2.G.1 Methods to reduce air pollutants include regulatory practices, conservation practices, and alternative fuels.
• STB-2.G.2 A vapor recovery nozzle is an air pollution control device on a gasoline pump that prevents fumes from escaping into the atmosphere when fueling a motor vehicle.
• STB-2.G.3 A catalytic converter is an air pollution control device for internal combustion engines that converts pollutants (CO, $NO_x$, and hydrocarbons) in exhaust into less harmful molecules ($CO_2$, $N_2$, $O_2$, and $H_2O$).
• STB-2.G.4 Wet and dry scrubbers are air pollution control devices that remove particulates and/or gases from industrial exhaust streams.
• STB-2.G.5 Methods to reduce air pollution from coal-burning power plants include scrubbers and electrostatic precipitators.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.H: Describe acid deposition.

• STB-2.H.1 Acid rain and deposition is due to nitrogen oxides and sulfur oxides from anthropogenic and natural sources in the atmosphere.
• STB-2.H.2 Nitric oxides that cause acid deposition come from motor vehicles and coal-burning power plants. Sulfur dioxides that cause acid deposition come from coal-burning power plants.

Learning Objective STB-2.I: Describe the effects of acid deposition on the environment.

• STB-2.I.1 Acid deposition mainly affects communities that are downwind from coal-burning power plants.
• STB-2.I.2 Acid rain and deposition can lead to the acidification of soils and bodies of water and corrosion of human-made structures.
• STB-2.I.3 Regional differences in soils and bedrock affect the impact that acid deposition has on the region—such as limestone bedrock's ability to neutralize the effect of acid rain on lakes and ponds.

Enduring Understanding (STB-2): Human activities have physical, chemical, and biological consequences for the atmosphere.

Learning Objective STB-2.J: Describe human activities that result in noise pollution and its effects.

• STB-2.J.1 Noise pollution is sound at levels high enough to cause physiological stress and hearing loss.
• STB-2.J.2 Sources of noise pollution in urban areas include transportation, construction, and domestic and industrial activity.
• STB-2.J.3 Some effects of noise pollution on animals in ecological systems include stress, the masking of sounds used to communicate or hunt, damaged hearing, and causing changes to migratory routes.