Introduction to Air Pollution - AP Environmental Science

Which pollutant has a major role in forming ground-level ozone?

Volatile organic compounds (VOCs). Reacts with $NO_x$ in sunlight to form ground-level ozone.
What are the health risks of exposure to high levels of lead in the air?

Neurological and developmental damage. Lead affects brain and nervous system development.
What is a catalytic converter's function in vehicles?

Reduces emissions of NOₓ, CO, and hydrocarbons. Converts toxic exhaust gases to less harmful compounds.
What is the effect of acid rain on aquatic ecosystems?

Lowers pH, harming aquatic life. Acidification disrupts aquatic food chains and ecosystems.
What are chlorofluorocarbons (CFCs) commonly used in?

Refrigerants and aerosol propellants. Synthetic compounds that deplete stratospheric ozone layer.
What is a secondary pollutant?

Pollutant formed by reaction of primary pollutants. Forms when primary pollutants undergo chemical reactions in atmosphere.
What does AQI stand for?

Air Quality Index. Scale from 0-500 indicating air pollution health risk levels.
What is the main source of nitrogen oxides (NOₓ)?

Combustion engines and industrial processes. High-temperature combustion produces nitrogen oxides.
Which type of pollution can cause eutrophication in water bodies?

Nitrogen oxides (NOₓ) from air pollution. Nitrogen compounds act as fertilizers, causing algal overgrowth.
Identify a primary pollutant from vehicle emissions.

Carbon monoxide (CO). Released directly from vehicle exhaust without chemical transformation.
Identify a strategy to mitigate air pollution from power plants.

Installation of scrubbers and filters. End-of-pipe technologies that remove pollutants before emission.
Identify a consequence of ozone layer depletion.

Increased UV radiation reaching Earth's surface. Stratospheric ozone depletion allows harmful UV rays through.
What is the main anthropogenic source of CO₂ emissions?

Burning of fossil fuels for energy. Human activities release stored carbon into atmosphere.
Identify a renewable energy source that reduces air pollution.

Solar energy. Produces electricity without combustion emissions.
What is the role of the Clean Air Act in the United States?

Regulates emissions of air pollutants. Federal law establishing air quality standards and emission limits.
Identify a primary indoor air pollutant.

Formaldehyde from building materials. Volatile organic compound released from construction materials.
How does deforestation contribute to air pollution?

Reduces CO₂ absorption, increasing atmospheric CO₂. Trees normally absorb $CO_2$ during photosynthesis.
What is the role of sunlight in the formation of photochemical smog?

Sunlight triggers reactions forming smog. UV radiation catalyzes reactions between $NO_x$ and VOCs.
Which gas is a major greenhouse gas contributing to global warming?

Carbon dioxide (CO₂). Traps heat in atmosphere through greenhouse effect.
What is the main component of smog?

Ground-level ozone (O₃). Forms when sunlight reacts with $NO_x$ and VOCs.
Identify a natural source of air pollution.

Volcanic eruptions releasing ash and gases. Natural geological processes release pollutants without human activity.
What is the primary cause of indoor air pollution in developing countries?

Use of biomass fuels for cooking and heating. Wood and coal burning releases particulates and toxic gases indoors.
Which agency monitors air quality in the United States?

Environmental Protection Agency (EPA). Federal agency responsible for air quality standards and enforcement.
What is PM2.5?

Particulate matter with diameter less than 2.5 micrometers. Fine particles penetrate deep into lungs and bloodstream.
What is the significance of the Montreal Protocol?

International treaty to phase out ozone-depleting substances. Global agreement that successfully reduced ozone depletion.
Identify a method to reduce vehicle emissions.

Use of catalytic converters. Chemical devices that convert harmful gases to less toxic compounds.
Which pollutant is typically removed by baghouse filters?

Particulate matter (PM). Fabric filters physically trap solid particles from gas streams.
What is a common source of volatile organic compounds (VOCs)?

Paints and solvents. Organic chemicals that evaporate easily at room temperature.
Identify a health risk of exposure to ground-level ozone.

Aggravates asthma and reduces lung function. Ground-level ozone irritates respiratory system.
Which pollutant is colorless and odorless, making it dangerous indoors?

Carbon monoxide (CO). Binds to hemoglobin, preventing oxygen transport in blood.
What is a temperature inversion in the context of air pollution?

A layer of warm air traps pollutants near the ground. Prevents vertical air mixing, concentrating pollutants at surface.
Which human activity is a major source of ammonia emissions?

Agriculture, particularly livestock waste. Animal waste decomposition releases nitrogen compounds.
Name a health effect of air pollution.

Respiratory diseases such as asthma. Particulates and gases irritate airways and lungs.
What is the main source of sulfur dioxide (SO₂)?

Burning of fossil fuels by power plants. Coal and oil combustion releases sulfur compounds as $SO_2$ .
What is the primary environmental impact of methane as a pollutant?

Significant greenhouse effect contributing to climate change. Methane has 25x greater warming potential than $CO_2$ .
What is the effect of air pollution on visibility?

Decreases visibility through haze formation. Particles scatter light, reducing visual clarity.
What is the purpose of air scrubbers in industrial settings?

Remove pollutants from exhaust streams. Chemical or physical systems that capture harmful emissions.

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