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

CEMS continuously measure and record pollutant concentrations directly at the emission point (e.g., a stack) in real time to demonstrate compliance with permit limits.

Question 2

What does the acronym NAAQS stand for?

Accepted Answer

National Ambient Air Quality Standards

Answer

NAAQS stands for National Ambient Air Quality Standards, which are EPA standards for outdoor (ambient) air quality for six criteria pollutants.

Question 3

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

Accepted Answer

Filterable particulate matter

Answer

EPA Method 5 is the reference method for determining filterable particulate matter emissions from stationary sources using a heated probe, filter, and impinger train.

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

Isokinetic sampling matches the probe inlet velocity to the stack gas velocity, preventing over- or under-sampling of particulates that would bias results.

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

Chemiluminescence analyzers detect NO2 by measuring the light emitted when nitric oxide (NO) reacts with ozone; NO2 is converted to NO before detection.

ETC - Environmental Technician Certification Practice Test

ETC - Environmental Technician Certification Practice Test

ETC Air Quality & Emissions Monitoring