AQS Pollution Sources 2 — Questions and Answers
Question 1: Which type of pollution source is a coal-fired power plant classified as under the Clean Air Act?
- Area source
- Mobile source
- Stationary point source (Correct answer)
- Fugitive source
Correct answer: Stationary point source
A coal-fired power plant is a stationary point source because it emits pollutants from a fixed, identifiable location such as a stack.
Question 2: Agricultural operations such as livestock farming primarily contribute which pollutant to ambient air?
- Sulfur dioxide
- Ammonia (Correct answer)
- Ozone
- Carbon monoxide
Correct answer: Ammonia
Livestock operations are among the largest contributors of ammonia emissions, which can form secondary particulate matter.
Question 3: What is the primary air quality concern from dry cleaning facilities?
- Nitrogen oxides
- Perchloroethylene (PERC) emissions (Correct answer)
- Carbon dioxide
- Hydrogen sulfide
Correct answer: Perchloroethylene (PERC) emissions
Dry cleaning facilities are regulated HAP sources because they emit perchloroethylene, a volatile organic compound and known carcinogen.
Question 4: Residential wood combustion is regulated primarily because it emits significant amounts of which pollutant?
- Ozone
- Nitrogen dioxide
- Fine particulate matter (PM2.5) (Correct answer)
- Sulfur trioxide
Correct answer: Fine particulate matter (PM2.5)
Residential wood burning is one of the largest area sources of PM2.5, contributing to wintertime air quality violations in many U.S. regions.
Question 5: Which emission source category does a municipal solid waste landfill fall under when releasing methane and non-methane organic compounds?
- Mobile source
- Biogenic source only
- Stationary area source subject to NSPS (Correct answer)
- Emergency source
Correct answer: Stationary area source subject to NSPS
Landfills are regulated as stationary area sources under NSPS Subpart WWW/Cf, requiring collection and control of landfill gas when emissions exceed thresholds.
Question 6: What distinguishes a Tier 3 mobile source emission standard from earlier tiers in the U.S.?
- It only applies to diesel trucks
- It sets vehicle and fuel standards together as a system (Correct answer)
- It exclusively regulates CO emissions
- It applies only to off-road equipment
Correct answer: It sets vehicle and fuel standards together as a system
Tier 3 standards treat vehicles and fuel as a system, requiring lower sulfur gasoline alongside tighter tailpipe emission limits for light-duty vehicles.
Question 7: Open burning of agricultural crop residue is considered what type of emission source?
- Point source
- Biogenic source
- Prescribed burn area source (Correct answer)
- Nonroad mobile source
Correct answer: Prescribed burn area source
Agricultural crop residue burning is classified as a prescribed burn area source that can be inventoried and regulated under state implementation plans.
AQS Pollution Sources 2
Which type of pollution source is a coal-fired power plant classified as under the Clean Air Act?