What are the types of atmospheric hazards?

• A. radioactive atmospheres only
• B. dust only
• C. oxygen deficient or oxygen enriched, flammable atmospheres, toxic atmosphere
• D. temperature extremes

Answer: (C)

Atmospheric hazards are conditions in the air that can harm people who enter or work in a space. The most important categories are when the air has too little or too much oxygen, when there are flammable or explosive gases or vapors, and when toxic substances are present in the air. This is why the best answer lists oxygen-deficient or oxygen-enriched atmospheres, flammable atmospheres, and toxic atmospheres. It covers the main ways air quality can become dangerous in many workplaces.

The other options are narrower or describe different kinds of hazards. Radioactive atmospheres aren’t a general category of atmospheric hazard for most standard contexts, dust represents a particulate hazard rather than a gas/air‑quality hazard, and temperature extremes are physical conditions but not specific atmospheric hazard categories related to gas composition or flammability.