CSS Cheat Sheet 2026

The 30 highest-yield CSS facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What is the lower explosive limit (LEL) threshold at which a confined space atmosphere is considered hazardous under OSHA standards? → 5% LEL
2. What should be done immediately after an accident occurs at work? → Provide first aid and medical treatment
3. The Hierarchy of Controls places PPE at which position? → Last (least effective)
4. What is the OSHA action level for occupational noise exposure under 29 CFR 1910.95? → 85 dBA 8-hr TWA
5. When conducting witness interviews after an incident, which of the following is a best practice for a safety supervisor? → Use open-ended questions like 'Tell me what you saw?'
6. Under the GHS hazard category numbering system, which category number represents the MOST severe hazard? → Category 1
7. Which physical agent hazard is assessed using the WBGT (Wet Bulb Globe Temperature) index? → Heat stress
8. What type of fire extinguisher is suitable for use on Class A, B, and C fires? → Dry chemical (ABC-rated)
9. Under OSHA's Hazard Communication Standard (29 CFR 1910.1200), how many sections are required on a Safety Data Sheet (SDS)? → 16
10. What term describes the concentration of a chemical at which 50% of a test animal population dies within a specified period? → LC50
11. What is the OSHA Permissible Exposure Limit (PEL) for an 8-hour time-weighted average (TWA) for noise in general industry? → 90 dBA
12. OSHA's Hazard Communication Standard (HazCom) requires Safety Data Sheets to follow which format? → 16-section GHS format
13. A Lifting Index (LI) value greater than what number indicates a high risk of work-related musculoskeletal disorders according to NIOSH? → 2.0
14. What is the importance of hazard communication in safety regulations? → To ensure workers are aware of potential hazards
15. A safety supervisor needs to select PPE for a worker handling concentrated sulfuric acid. Which glove material offers the BEST chemical resistance? → Butyl rubber
16. How should a safety officer respond to a workplace emergency? → By staying calm and following emergency procedures
17. What OSHA standard governs the design, installation, and use of fixed fire suppression systems in general industry? → 29 CFR 1910.155 through 1910.165
18. Under 29 CFR 1910.146, how long must a completed confined space entry permit be retained after the work it covers is completed? → At least 1 year
19. What is the purpose of OSHA regulations in workplace safety? → To ensure safe working conditions and prevent injuries
20. What is a common method for evaluating risk control effectiveness? → Through audits, feedback, and incident analysis
21. Which air-purifying respirator cartridge color coding indicates protection against organic vapors per NIOSH/ANSI standards? → Black
22. What is the purpose of engineering controls in hazard control? → To limit employee exposure to hazards through machine design
23. Which type of hearing protection typically provides the highest Noise Reduction Rating (NRR) in occupational settings? → Foam earplugs
24. What does the acronym IDLH stand for in industrial hygiene? → Immediate Danger to Life and Health
25. Which body region is most frequently affected by ergonomic hazards in office and computer workstation environments? → Neck and upper extremities
26. Which route of entry is typically the MOST common pathway for workplace chemical exposure? → Inhalation
27. What does the NFPA 70E standard address in U.S. workplaces? → Electrical safety in the workplace and arc flash PPE
28. What is the flash point of a flammable liquid as classified under OSHA's Flammable Liquids standard? → Below 100°F (37.8°C)
29. Which glove material offers the best chemical resistance to ketones and esters? → Butyl rubber
30. The GHS pictogram featuring a flame placed over a circle indicates which type of hazard? → Oxidizing substance