MPH Environmental & Occupational Health 1 — Questions and Answers
Question 1: Which federal agency in the U.S. is primarily responsible for regulating workplace safety and health standards?
- EPA
- CDC
- OSHA (Correct answer)
- NIOSH
Correct answer: OSHA
The Occupational Safety and Health Administration (OSHA) sets and enforces workplace safety standards under the Department of Labor.
Question 2: The 'dose-response relationship' in toxicology means:
- A drug dose determines the speed of patient response
- As exposure to a toxin increases, the health effect typically increases (Correct answer)
- Higher doses are always more toxic than lower doses
- The response depends on the route of exposure, not the dose
Correct answer: As exposure to a toxin increases, the health effect typically increases
The dose-response relationship is a fundamental toxicological principle stating that the magnitude of the biological effect increases with increasing dose.
Question 3: What is the Permissible Exposure Limit (PEL) in occupational health?
- The maximum level of air pollutants allowed outdoors
- The regulatory limit for worker exposure to chemical hazards (Correct answer)
- The dose at which 50% of animals show a toxic effect
- The threshold below which no adverse effect is expected
Correct answer: The regulatory limit for worker exposure to chemical hazards
PELs are OSHA-mandated limits on the concentration of hazardous substances that workers can be exposed to during an 8-hour workday.
Question 4: Lead exposure in children is most associated with:
- Respiratory disease
- Neurodevelopmental impairment (Correct answer)
- Liver toxicity
- Skin sensitization
Correct answer: Neurodevelopmental impairment
Lead is a neurotoxin especially harmful to developing brains, causing cognitive deficits, behavioral problems, and reduced IQ in children.
Question 5: Which of the following is a primary air pollutant regulated under the U.S. Clean Air Act?
- Acid rain
- Ground-level ozone
- Particulate matter (PM2.5) (Correct answer)
- Smog
Correct answer: Particulate matter (PM2.5)
PM2.5 is one of the six criteria air pollutants directly regulated under the Clean Air Act's National Ambient Air Quality Standards.
Question 6: Asbestos exposure is most strongly associated with which disease?
- Emphysema
- Mesothelioma (Correct answer)
- Lung adenocarcinoma
- Silicosis
Correct answer: Mesothelioma
Mesothelioma, a cancer of the pleural lining, is almost exclusively caused by asbestos exposure and has a long latency period.
MPH Environmental & Occupational Health 1
Which federal agency in the U.S. is primarily responsible for regulating workplace safety and health standards?