Which condition traps air near the surface and impedes dispersion of air, gases, and vapors?

• A. Air Inversion
• B. Temperature Inversion
• C. Thermal Inversion
• D. Atmospheric Stability

Answer: (A)

Air inversions create a shallow, stable layer that prevents air from rising and mixing. When cooler air sits near the ground with a warmer layer above it, vertical movement slows dramatically, so air, gases, and vapors near the surface aren’t dispersed but become trapped and can accumulate.

The situation described fits the term air inversion best, because it emphasizes the trapping of surface air. Temperature inversion and thermal inversion describe the same vertical temperature pattern causing the trap, but the prompt points to the effect on surface air specifically. Atmospheric stability is related, since a stable atmosphere supports such trapping, but it’s a broader concept rather than the specific condition that keeps surface air from dispersing.