AQS Health & Safety Protocols 2

Question 1

Under OSHA's Permissible Exposure Limit (PEL) for respirable crystalline silica, what is the 8-hour TWA limit for general industry?

Accepted Answer

50 μg/m³

Answer

OSHA's PEL for respirable crystalline silica in general industry is 50 μg/m³ as an 8-hour TWA.

Question 2

Which respiratory protection program element is required by OSHA 29 CFR 1910.134 before an employee uses a tight-fitting respirator?

Accepted Answer

Medical evaluation by a physician or PLHCP

Answer

OSHA 1910.134 requires a medical evaluation by a licensed physician or other licensed healthcare professional (PLHCP) prior to fit testing or respirator use.

Question 3

A community living near a chemical plant reports frequent headaches and eye irritation. Which acute health endpoint should the air quality specialist prioritize investigating first?

Accepted Answer

Irritant gas exposures at ground-level

Answer

Acute mucous-membrane irritation symptoms (headaches, eye irritation) most directly implicate short-term exposures to irritant gases at breathing level.

Question 4

Which document establishes the hierarchy of controls for occupational air contaminants, from most to least preferred?

Accepted Answer

ANSI/AIHA Z10 Occupational Health and Safety Management System standard

Answer

ANSI/AIHA Z10 formally establishes the hierarchy of controls (elimination → substitution → engineering → administrative → PPE) for occupational hazards.

Question 5

A worker is potentially exposed to hydrogen sulfide (H₂S) at 20 ppm for a 10-hour shift. What action is most appropriate based on NIOSH guidance?

Accepted Answer

Provide supplied-air respirator; NIOSH REL ceiling is 10 ppm

Answer

NIOSH sets a ceiling REL of 10 ppm for H₂S; exposures at 20 ppm exceed this limit and require engineering controls and appropriate respiratory protection.

(AQS) Air Quality Specialist Certification Practice Test

(AQS) Air Quality Specialist Certification Practice Test

AQS Health & Safety Protocols 2