NEHA Study Guide 2026
Everything you need to pass the NEHA exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 NEHA Exam Format at a Glance
📚 NEHA Topics to Study (22)
✍️ Sample NEHA Questions & Answers
1. What is a 'threshold limit value (TLV)' as published by the American Conference of Governmental Industrial Hygienists (ACGIH)?
ACGIH TLVs are professionally recommended occupational exposure guidelines — not legal standards — representing concentrations to which nearly all workers can be repeatedly exposed day after day without adverse health effects.
2. Secondhand smoke in residential environments is classified by the EPA as which category of carcinogen?
The EPA classifies environmental tobacco smoke (secondhand smoke) as a Group A known human carcinogen based on sufficient epidemiological evidence of lung cancer causation.
3. In environmental health inspections, what practice is most effective for preventing rodent entry into structures?
Exclusion is the most permanent and effective rodent control strategy, involving the physical sealing of all entry points ≥ 1/4 inch since mice can enter through very small gaps.
4. Which solid waste management strategy is ranked highest in the EPA's solid waste management hierarchy?
Source reduction and reuse are ranked highest in the EPA hierarchy because preventing waste generation is more effective than managing waste after it is created.
5. Under what conditions can an environmental health official conduct an inspection of a regulated facility without a warrant?
The US Supreme Court has established that administrative inspections of pervasively regulated industries may be conducted without a warrant when performed during business hours in accordance with a regulatory inspection scheme.
6. What personal protective measure is recommended for preventing tick-borne disease during outdoor activities?
EPA-registered repellents containing DEET applied to skin and permethrin applied to clothing, combined with thorough post-activity tick checks and prompt tick removal, are the recommended personal protection measures.