CEP CEP Air Quality & Atmospheric Science 1 — Questions and Answers
Question 1: Which U.S. federal law establishes the primary framework for regulating outdoor air quality and sets National Ambient Air Quality Standards (NAAQS)?
- Clean Water Act
- Clean Air Act (Correct answer)
- Resource Conservation and Recovery Act
- Safe Drinking Water Act
Correct answer: Clean Air Act
The Clean Air Act (CAA), originally passed in 1963 and significantly amended in 1970 and 1990, is the primary federal law governing air quality and authorizes the EPA to set NAAQS.
Question 2: A 'criteria air pollutant' regulated under NAAQS includes which of the following?
- Dioxins
- Particulate Matter (PM2.5) (Correct answer)
- Polychlorinated biphenyls (PCBs)
- Radon
Correct answer: Particulate Matter (PM2.5)
PM2.5 is one of six criteria air pollutants regulated under NAAQS; the others are ozone, CO, NO2, SO2, and lead.
Question 3: What is the primary difference between a 'primary' and 'secondary' NAAQS standard?
- Primary standards protect vegetation; secondary standards protect human health
- Primary standards protect public health; secondary standards protect public welfare (Correct answer)
- Primary standards are set by states; secondary standards are set by EPA
- Primary standards apply to rural areas; secondary standards apply to urban areas
Correct answer: Primary standards protect public health; secondary standards protect public welfare
Primary NAAQS are designed to protect public health (including sensitive populations), while secondary standards protect public welfare such as crops, vegetation, and visibility.
Question 4: Which air quality modeling approach is most commonly used by EPA for dispersion modeling of industrial stack emissions?
- AERMOD (Correct answer)
- SWMM
- HEC-RAS
- WASP
Correct answer: AERMOD
AERMOD (AMS/EPA Regulatory Model) is EPA's preferred steady-state Gaussian plume model for near-field dispersion of air pollutant emissions from stationary sources.
Question 5: Under the Clean Air Act, a 'nonattainment area' is defined as a region where:
- A new major source is being constructed
- Ambient air quality exceeds one or more NAAQS (Correct answer)
- State Implementation Plan has not been submitted
- Air quality monitoring stations are absent
Correct answer: Ambient air quality exceeds one or more NAAQS
A nonattainment area is a geographic area that does not meet (or 'attain') one or more of the NAAQS for criteria air pollutants.
Question 6: The term 'fugitive emissions' in air quality management refers to:
- Emissions from mobile sources such as cars
- Pollutants released from permitted stacks
- Emissions not released through a stack, vent, or other confined flow (Correct answer)
- Greenhouse gases tracked under voluntary reporting
Correct answer: Emissions not released through a stack, vent, or other confined flow
Fugitive emissions are pollutants that escape into the atmosphere without passing through a control device or defined exhaust point, such as dust from unpaved roads or leaks from equipment.
CEP CEP Air Quality & Atmospheric Science 1
Which U.S. federal law establishes the primary framework for regulating outdoor air quality and sets National Ambient Air Quality Standards (NAAQS)?