AP Environmental Science Quiz: Atmospheric Co2 And Particulates

What this quiz covers

This quiz focuses on Atmospheric Co2 And Particulates, giving you a quick way to practice the rules, question types, and explanations that matter most for AP Environmental Science.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

Question 1

1. Scrubbers remove sulfur compounds and particulates from flue gas but do not capture most CO$_2$ produced by carbon combustion. (correct answer)
2. Scrubbers convert CO$_2$ into SO$_2$, so lowering SO$_2$ necessarily increases CO$_2$ emissions from the same plant.
3. CO$_2$ emissions are eliminated automatically when PM is removed, because particles are the main carrier of carbon dioxide.
4. Scrubbers only work in the stratosphere, so their installation cannot affect tropospheric SO$_2$ or PM concentrations.

Question 2

1. Short‑term variability can occur around a clear long‑term upward trend, so climate-relevant signals require multi-year observations. (correct answer)
2. Daily fluctuations prove CO$_2$ is not increasing long‑term, because true increases cannot coexist with short‑term variability.
3. The 10-year rise indicates instrument drift only, since atmospheric CO$_2$ cannot change measurably on decadal timescales.
4. Daily CO$_2$ changes are controlled solely by volcanic eruptions, while decadal changes are controlled solely by ocean tides.

Question 3

1. Northern Hemisphere plant growth increases photosynthetic uptake in summer, lowering atmospheric CO$_2$ after a winter accumulation period. (correct answer)
2. Ocean tides remove CO$_2$ from air each summer by turning it into ozone, then release it again in winter.
3. Volcanic eruptions occur every spring, adding CO$_2$ until May, then stop completely and allow levels to fall.
4. Summer sunlight breaks CO$_2$ into nitrogen and oxygen, reducing concentrations until winter darkness restores CO$_2$ molecules.

Question 4

1. Less sulfur in fuel reduces SO$_2$ emissions, decreasing sulfate aerosol formation that contributes substantially to fine particulate mass. (correct answer)
2. Low-sulfur fuel increases NO$_x$ emissions, which directly precipitates as dust, lowering PM$_{2.5}$ concentrations in the air.
3. Low-sulfur fuel converts CO$_2$ into soot, which is heavier and settles faster, reducing measured PM$_{2.5}$.
4. Removing sulfur increases ozone formation, which destroys airborne particles by splitting them into nitrogen gas and oxygen gas.

Question 5

1. More CO$_2$ is absorbing infrared radiation at specific wavelengths, reducing outgoing energy to space and strengthening the greenhouse effect. (correct answer)
2. CO$_2$ is reflecting visible light, increasing Earth's albedo, so the planet must cool as CO$_2$ rises.
3. PM$_{2.5}$ is absorbing infrared radiation at CO$_2$ bands, proving particles, not gases, control the greenhouse effect.
4. Decreased longwave radiation means the Sun is dimming, because solar output determines outgoing longwave radiation at CO$_2$ wavelengths.

Question 6

1. Reducing NO$_x$ and VOC emissions limits photochemical ozone formation during sunny conditions, decreasing episodic ground-level ozone peaks. (correct answer)
2. Reducing CO$_2$ emissions directly prevents ozone formation because CO$_2$ photolyzes into O$_3$ under UV radiation.
3. Reducing PM$_{10}$ alone always increases ozone because particles are the only source of oxygen atoms for ozone.
4. Reducing nitrogen gas (N$_2$) in air lowers ozone because N$_2$ is the primary reactant producing O$_3$ in smog.

Question 7

1. Higher CO$_2$ strengthens the greenhouse effect, increasing temperatures and melting sea ice; reduced ice also lowers albedo, amplifying warming. (correct answer)
2. Higher CO$_2$ increases ocean salinity, which freezes seawater more easily, so sea ice decline must be unrelated to CO$_2$ trends.
3. CO$_2$ directly dissolves sea ice by reacting with solid water to form carbonic acid, causing melting without temperature change.
4. Sea ice decline increases CO$_2$ by converting oxygen into carbon dioxide through photochemical reactions on ice surfaces.

Question 8

1. The annual increase in atmospheric CO$_2$ slows over time, reflecting reduced net global emissions relative to sink uptake capacity. (correct answer)
2. CO$_2$ concentration drops to preindustrial levels within one year, because taxes immediately remove existing CO$_2$ from the atmosphere.
3. PM$_{2.5}$ increases sharply, which proves the carbon tax reduced CO$_2$ emissions because both pollutants always move together.
4. CO$_2$ continues increasing at the same rate, which proves the carbon tax worked because concentrations must rise to stabilize climate.

Question 9

1. Acid deposition decreases because SO$_2$ forms sulfuric acid aerosols and contributes to acidic precipitation and regional haze. (correct answer)
2. The greenhouse effect decreases because SO$_2$ is the primary long-lived greenhouse gas controlling infrared absorption globally.
3. Stratospheric ozone depletion decreases because SO$_2$ directly releases chlorine radicals responsible for the Antarctic ozone hole.
4. Ocean tides become smaller because fewer sulfate particles reduce the Moon's gravitational influence on Earth's oceans.

Question 10

1. CO$_2$ is a long-lived greenhouse gas measured in ppm, while PM$_{2.5}$ is short-lived particulate pollution measured in µg/m$^3$. (correct answer)
2. PM$_{2.5}$ is a greenhouse gas measured in ppm, while CO$_2$ is particulate matter measured in µg/m$^3$.
3. Both are identical pollutants; the different units are arbitrary and indicate no chemical or physical differences in the atmosphere.
4. CO$_2$ causes acute respiratory irritation within hours, while PM$_{2.5}$ affects climate only over centuries due to long lifetime.

Question 11

1. CO$_2$ is more abundant and long-lived; CH$_4$ is less abundant but more potent per molecule over shorter time horizons. (correct answer)
2. CH$_4$ is more abundant than CO$_2$, but weaker at absorbing infrared radiation, so it has a lower warming effect.
3. CO$_2$ has higher global warming potential than CH$_4$ over 20 years because it is chemically more reactive.
4. Both gases are removed primarily by gravitational settling, so atmospheric lifetimes are similar and trends should match exactly.

Question 12

1. Combustion of fossil fuels for electricity, transportation, and industry releases geologic carbon as CO$_2$ faster than natural sinks remove it. (correct answer)
2. Enhanced photosynthesis in croplands releases CO$_2$ as a waste product, increasing atmospheric concentrations after 1950.
3. Use of catalytic converters converts nitrogen gas into CO$_2$, making vehicle emission controls the largest CO$_2$ source.
4. Stratospheric ozone depletion produces CO$_2$ directly by splitting O$_2$ molecules, accelerating post-1950 CO$_2$ increases.

Question 13

1. Toxic compounds like dioxins and polycyclic aromatic hydrocarbons often decrease because open burning emits incomplete-combustion byproducts along with particulates. (correct answer)
2. Stratospheric chlorine radicals decrease because open burning is the primary source of CFCs emitted directly from household trash.
3. Helium concentrations decrease because open burning produces helium gas as the main product of plastic combustion.
4. Radon emissions decrease because open burning prevents uranium decay in soils near the burn sites.

Question 14

1. Wildfires emit both particulates and CO$_2$; particulates are short-lived locally, while CO$_2$ persists longer and accumulates globally. (correct answer)
2. Wildfires emit only PM$_{2.5}$; any observed CO$_2$ increase must be from ocean evaporation during the same period.
3. Wildfire PM$_{2.5}$ remains in the atmosphere for centuries, whereas CO$_2$ settles out within days through gravitational deposition.
4. Wildfires reduce atmospheric CO$_2$ because burning converts carbon into oxygen, lowering greenhouse gas concentrations.

Question 15

1. Warming can increase soil microbial respiration and permafrost thaw, releasing additional CO$_2$ and CH$_4$ and amplifying greenhouse warming. (correct answer)
2. Warming increases ocean alkalinity automatically, causing greater CO$_2$ precipitation and reducing atmospheric CO$_2$ through negative feedback.
3. Longer ice-free seasons reduce evaporation, which lowers cloud cover and therefore removes CO$_2$ by photodecomposition in sunlight.
4. Warming increases stratospheric ozone, which reacts with CO$_2$ to form limestone, permanently lowering atmospheric CO$_2$.

Question 16

1. Air-quality regulations can reduce particulates without proportionally reducing greenhouse gases, so climate mitigation may require additional policies. (correct answer)
2. Declining PM$_{2.5}$ proves CO$_2$ must soon decline automatically because both pollutants are chemically identical in the atmosphere.
3. Rising CO$_2$ causes PM$_{2.5}$ to fall by converting particles into carbon dioxide, explaining the diverging trends directly.
4. Declining PM$_{2.5}$ indicates decreasing fossil-fuel use globally, so increasing CO$_2$ must be a measurement artifact.

Question 17

1. Winter temperature inversions trap pollutants near the surface, raising PM$_{2.5}$, while CO$_2$ remains relatively well-mixed regionally. (correct answer)
2. Summer inversions are stronger, so PM$_{2.5}$ should be highest in summer; the observed winter peak indicates faulty monitors.
3. CO$_2$ is removed by rain in winter, but PM$_{2.5}$ is not, producing higher winter particle concentrations.
4. PM$_{2.5}$ forms only from ocean spray in winter, and inland summer air cannot contain fine particles at all.

Question 18

1. Issue short‑term public health advisories to reduce exposure, such as limiting outdoor activity and using filtration, targeting acute PM impacts. (correct answer)
2. Ignore the event because CO$_2$ is unchanged; only greenhouse gases affect human health over the next few days.
3. Increase vehicle idling to warm the air, which disperses PM$_{2.5}$ without changing pollution or exposure levels.
4. Spray CFC aerosols to thicken the ozone layer, which immediately removes PM$_{2.5}$ by converting particles into oxygen.

Question 19

1. Mandating catalytic converters and low-NO$_x$ burners reduces nitrogen oxides from vehicles and power plants without necessarily reducing CO$_2$. (correct answer)
2. Banning CFCs eliminates NO$_x$ formation in the troposphere by preventing ozone depletion and increasing nitrogen fixation rates.
3. Adding lead to gasoline reduces NO$_x$ by increasing fuel octane, which simultaneously lowers atmospheric CO$_2$ concentrations.
4. Increasing coal combustion reduces NO$_x$ by lowering combustion temperatures, but increases PM$_{2.5}$ and decreases CO$_2$.

Question 20

1. Reduced volcanic eruptions lowered CO$_2$ emissions and increased PM$_{2.5}$, explaining both long‑term observed trends simultaneously.
2. Cleaner combustion controls reduced particulate emissions, while continued fossil-fuel use increased CO$_2$, producing diverging air-quality and climate trends. (correct answer)
3. Rising CO$_2$ chemically converts PM$_{2.5}$ into oxygen gas, lowering measured particle concentrations in cities over time.
4. Lower PM$_{2.5}$ indicates less photosynthesis, which removes less CO$_2$ and therefore causes CO$_2$ to rise rapidly.