CEI Air Quality Management 2 — Questions and Answers
Question 1: Which air sampling device separates collected particles into size fractions based on aerodynamic diameter?
- Colorimetric detector tube
- Wet scrubber
- Cascade impactor (Correct answer)
- Grab sampler
Correct answer: Cascade impactor
A cascade impactor collects particles in successive stages at progressively higher velocities, separating them by aerodynamic diameter for size-resolved mass distribution analysis.
Question 2: What does PM10 specifically refer to in air quality monitoring?
- Pollutants measured over 10-minute sampling intervals
- Particulate matter with aerodynamic diameter of 10 micrometers or less (Correct answer)
- A specific EPA monitoring protocol designation
- Particles with exactly 10 micrometer diameter
Correct answer: Particulate matter with aerodynamic diameter of 10 micrometers or less
PM10 is inhalable particulate matter with an aerodynamic diameter ≤10 micrometers, which can penetrate into the upper airways and lungs.
Question 3: Which instrument is the EPA Federal Reference Method for continuous ambient ozone monitoring?
- Flame ionization detector
- Gas chromatograph
- Atomic absorption spectrometer
- UV photometric analyzer (Correct answer)
Correct answer: UV photometric analyzer
UV photometric analyzers measure ozone continuously by detecting its absorption of UV light at 254 nm and serve as EPA's Federal Reference Method for ambient ozone monitoring.
Question 4: What is the primary purpose of EPA-designated reference methods in air quality monitoring?
- Calculate emission inventory totals for facilities
- Determine permit application fees
- Provide the official benchmark for measuring a specific pollutant (Correct answer)
- Maintain historical records of past measurements
Correct answer: Provide the official benchmark for measuring a specific pollutant
EPA reference methods are the officially designated measurement procedures used to determine compliance with NAAQS and to validate other monitoring equipment and alternative methods.
Question 5: EPA Method 9 is used to measure which characteristic of stack emissions?
- Total hydrocarbon concentration
- Sulfur dioxide concentration
- Particulate matter mass by gravimetric analysis
- Visible emission opacity (Correct answer)
Correct answer: Visible emission opacity
EPA Method 9 is the visual determination of the opacity of emissions from stationary sources, requiring certified observers trained to estimate the percentage of light blocked by a visible plume.
Question 6: Which term best describes air pollutant releases from equipment leaks, storage pile dust, and material handling rather than from stacks?
- Emissions that escape regulatory reporting requirements
- Radioactive gases released from nuclear facilities
- Fugitive emissions (Correct answer)
- Mobile source emissions from heavy-duty trucks
Correct answer: Fugitive emissions
Fugitive emissions are releases of air pollutants from sources not captured and routed through an exhaust stack or vent, bypassing installed pollution control equipment.
Question 7: Which monitoring network do states primarily operate to assess NAAQS compliance using ambient air measurements?
- USGS Surface Water Network
- EPA Superfund Air Monitoring System
- NOAA Weather Observation Network
- State and Local Air Monitoring Stations (SLAMS) (Correct answer)
Correct answer: State and Local Air Monitoring Stations (SLAMS)
SLAMS is the principal air quality monitoring network operated by state and local agencies under EPA oversight to measure ambient pollutant concentrations for NAAQS compliance determination.
CEI Air Quality Management 2
Which air sampling device separates collected particles into size fractions based on aerodynamic diameter?