Practice Test Geeks(CES) Certified Environmental Scientist Practice Test
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Air Quality Monitoring & Standards Flashcards

7 cards from real CES practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Air Quality Monitoring & Standards flashcards as text

  1. What is the primary purpose of a collocated sampler in an ambient monitoring network?

    Answer: To assess precision and quality control of the primary sampler

    Collocated samplers operate simultaneously alongside primary monitors to assess measurement precision and data quality as required by 40 CFR Part 58 QA requirements.

  2. Which of the following best describes 'receptor modeling' in air quality science?

    Answer: Using measured ambient data to mathematically apportion contributions from different source types

    Receptor modeling uses chemical mass balance or factor analysis of ambient measurements at a receptor site to estimate the fractional contribution of different source categories to observed concentrations.

  3. The Prevention of Significant Deterioration (PSD) program applies to new or modified major sources in:

    Answer: Attainment and unclassifiable areas

    PSD regulations apply in attainment and unclassifiable areas to prevent significant deterioration of air quality by requiring BACT analysis and ambient impact analysis for major new or modified sources.

  4. A chemiluminescence analyzer used to measure NO2 in ambient air actually measures:

    Answer: Total NOx by converting NO2 to NO via a molybdenum converter, then measuring NO

    Conventional chemiluminescence NO2 analyzers measure total NOx by reducing NO2 to NO in a molybdenum converter, then reacting NO with O3 to produce chemiluminescence; NO2 is calculated by difference.

  5. Which document must a CES professional understand when evaluating air quality data collected near a wildfire for regulatory purposes?

    Answer: EPA's Exceptional Events Rule (40 CFR Part 50.14)

    EPA's Exceptional Events Rule (40 CFR Part 50.14) provides the process for states to demonstrate that monitored concentrations influenced by wildfires or other exceptional events should be excluded from NAAQS attainment determinations.

  6. In the context of air toxics risk assessment, the cancer risk benchmark used by EPA for individual lifetime excess cancer risk from a single source is typically:

    Answer: 1 in 1,000,000 (10⁻⁶)

    EPA's acceptable risk range for individual excess lifetime cancer risk from air toxics is generally 1 in 1,000,000 (10⁻⁶) as a benchmark, with 1 in 10,000 (10⁻⁴) as a level of concern.

  7. Which federal agency, in addition to EPA, plays a role in regulating aircraft emissions that affect ambient air quality in the US?

    Answer: Federal Aviation Administration (FAA)

    While EPA sets emission standards for aircraft engines under the Clean Air Act, the FAA has authority over aircraft operations and coordinates with EPA on implementing aircraft emission standards.