CES Air Quality Management & Monitoring 2 — Questions and Answers
Question 1: What is the primary purpose of a Title V Operating Permit under the Clean Air Act?
- To authorize construction of new emission sources only
- To consolidate all applicable air quality requirements for major sources into a single enforceable permit (Correct answer)
- To establish ambient air quality standards for local jurisdictions
- To regulate greenhouse gas emissions exclusively
Correct answer: To consolidate all applicable air quality requirements for major sources into a single enforceable permit
Title V operating permits consolidate all federal, state, and local air quality requirements applicable to a major source into one comprehensive, federally enforceable permit.
Question 2: Which instrument is commonly used to measure ambient concentrations of fine particulate matter (PM2.5) in continuous monitoring networks?
- Flame ionization detector (FID)
- Tapered element oscillating microbalance (TEOM) (Correct answer)
- Gas chromatograph-mass spectrometer (GC-MS)
- Photoionization detector (PID)
Correct answer: Tapered element oscillating microbalance (TEOM)
The Tapered Element Oscillating Microbalance (TEOM) is a widely used continuous ambient particulate monitor that measures mass concentration by detecting changes in oscillation frequency of a filter element.
Question 3: Under the New Source Performance Standards (NSPS), which EPA program applies to new or modified stationary sources to limit emissions using the best demonstrated technology?
- National Emission Standards for Hazardous Air Pollutants (NESHAP)
- New Source Performance Standards (NSPS) (Correct answer)
- State Implementation Plan (SIP)
- Reasonably Available Control Technology (RACT)
Correct answer: New Source Performance Standards (NSPS)
NSPS (40 CFR Part 60) set emission limits for new and modified stationary sources in specific industrial categories based on the best demonstrated technology available.
Question 4: An area that fails to meet NAAQS for a criteria pollutant is classified as a:
- Compliance zone
- Nonattainment area (Correct answer)
- Sensitive receptor area
- Prevention of Significant Deterioration area
Correct answer: Nonattainment area
A nonattainment area is a geographic region where ambient air quality does not meet NAAQS for one or more criteria pollutants, triggering additional regulatory requirements.
Question 5: Which meteorological parameter most significantly influences the vertical mixing and dispersion of air pollutants from a stack?
- Relative humidity
- Atmospheric stability class (Correct answer)
- Precipitation frequency
- Barometric pressure
Correct answer: Atmospheric stability class
Atmospheric stability class (commonly described using Pasquill-Gifford stability classes A through F) governs vertical mixing and turbulence, directly controlling how pollutants disperse from a stack.
Question 6: What does the term 'fugitive emissions' refer to in air quality management?
- Emissions that exceed permitted limits and escape regulatory oversight
- Unintentional emissions not released through a stack or vent, such as from leaks or unpaved roads (Correct answer)
- Emissions from mobile sources that travel across state lines
- Emissions captured and stored underground
Correct answer: Unintentional emissions not released through a stack or vent, such as from leaks or unpaved roads
Fugitive emissions are air pollutants that are not emitted through a stack, vent, or other confined release point, such as leaks from equipment seals, unpaved road dust, or open stockpiles.
Question 7: Which air pollutant is the primary precursor to ground-level ozone formation in photochemical smog?
- Sulfur dioxide and hydrogen sulfide
- Volatile organic compounds (VOCs) and nitrogen oxides (NOx) (Correct answer)
- Carbon monoxide and lead
- Ammonia and hydrogen fluoride
Correct answer: Volatile organic compounds (VOCs) and nitrogen oxides (NOx)
Ground-level ozone is formed through photochemical reactions between volatile organic compounds (VOCs) and nitrogen oxides (NOx) in the presence of sunlight.
CES Air Quality Management & Monitoring 2
What is the primary purpose of a Title V Operating Permit under the Clean Air Act?