AQS Mitigation Strategies 2

Question 1

Which control technology is most effective for reducing fine particulate matter (PM2.5) from industrial stack emissions?

Accepted Answer

Fabric filter (baghouse)

Answer

Fabric filters (baghouses) achieve collection efficiencies above 99% for PM2.5 and are among the most effective controls for fine particulate emissions.

Question 2

An industrial facility installs a regenerative thermal oxidizer (RTO). What pollutant class does this primarily control?

Accepted Answer

Volatile organic compounds (VOCs)

Answer

RTOs combust VOCs at high temperatures (typically 1,400–1,600°F) with heat recovery efficiencies of 95% or more.

Question 3

Selective catalytic reduction (SCR) systems inject which reagent to reduce NOx emissions?

Accepted Answer

Ammonia or urea

Answer

SCR systems inject ammonia (or urea that hydrolyzes to ammonia) into flue gas where it reacts with NOx over a catalyst to form N₂ and H₂O.

Question 4

What is the primary purpose of a flue gas desulfurization (FGD) scrubber in a coal-fired power plant?

Accepted Answer

Capture SO2 using an alkaline sorbent

Answer

FGD scrubbers react SO2 in flue gas with an alkaline reagent such as limestone slurry, forming calcium sulfite or gypsum as a byproduct.

Question 5

In transportation air quality planning, Transportation Demand Management (TDM) reduces emissions primarily by:

Accepted Answer

Reducing the number of vehicle miles traveled (VMT)

Answer

TDM strategies such as ridesharing, telecommuting, and transit incentives aim to reduce VMT, thereby cutting total mobile-source emissions.

(AQS) Air Quality Specialist Certification Practice Test

(AQS) Air Quality Specialist Certification Practice Test

AQS Mitigation Strategies 2