ETC Air Quality & Emissions Monitoring

Question 1

What is the primary purpose of a Continuous Emissions Monitoring System (CEMS)?

Accepted Answer

To provide real-time measurement of pollutant emissions from a stationary source

Answer

To measure pollutant concentrations in ambient outdoor air

Answer

To collect grab samples of stack gases for laboratory analysis

Answer

To model the dispersion of pollutants from a facility

Question 2

What does the acronym NAAQS stand for?

Accepted Answer

National Ambient Air Quality Standards

Answer

National Air Analysis and Quality System

Answer

Nationwide Assessment of Air Quality Sources

Answer

National Authority for Atmospheric Quality and Safety

Question 3

EPA Method 5 is primarily used to measure which type of air pollutant from stationary sources?

Accepted Answer

Filterable particulate matter

Answer

Sulfur dioxide (SO2)

Answer

Nitrogen oxides (NOx)

Answer

Carbon monoxide (CO)

Question 4

What is the purpose of isokinetic sampling during stack emissions testing?

Accepted Answer

To match the sampling velocity to the stack gas velocity so representative particulate samples are collected

Answer

To ensure the sample gas is cooled to a standard temperature before measurement

Answer

To neutralize acidic gases before they contact the sampling filter

Answer

To maintain a constant flow rate through the sample pump regardless of stack pressure

Question 5

Which analyzer technology is most commonly used to measure ambient nitrogen dioxide (NO2) concentrations in continuous air quality monitors?

Accepted Answer

Chemiluminescence

Answer

Non-dispersive infrared (NDIR) absorption

Answer

Ultraviolet fluorescence

Answer

Electrochemical cell

Question 6

What unit of measurement is used for the 24-hour NAAQS standard for PM2.5?

Accepted Answer

Micrograms per cubic meter (µg/m³)

Answer

Parts per million (ppm)

Answer

Milligrams per liter (mg/L)

Answer

Nanograms per cubic meter (ng/m³)

Question 7

Which EPA-approved method is used to collect volatile organic compound (VOC) air samples for subsequent laboratory analysis?

Accepted Answer

SUMMA canister or Tedlar bag with EPA TO-15

Answer

EPA Method 8

Answer

EPA Method 5 impinger train

Answer

High-volume Hi-Vol sampler