How does a temperature inversion affect urban air quality and ground-level pollutant concentrations?

How does a temperature inversion affect urban air quality and ground-level pollutant concentrations?

• A. Inversion enhances vertical mixing and disperses pollutants.
• B. A temperature inversion traps pollutants near the surface by suppressing vertical mixing, leading to elevated concentrations and smog.
• C. Inversions have no impact on air quality.
• D. Inversions pull pollutants away from the city.

Answer: (B)

A temperature inversion creates a lid on the lowest part of the atmosphere, making the air near the ground unusually stable and suppressing vertical mixing. Because warm air sits above cooler air, air near the surface can’t rise and disperse pollutants, so emissions from vehicles, industry, and other sources build up rather than dilute. With limited mixing, ground-level pollutant concentrations rise and smog can form, especially on sunny, stagnant days. Inversions don’t enhance mixing, they inhibit it. They do have a real impact on air quality, and they don’t pull pollutants away from the city; they keep them near the surface where people breathe.

A temperature inversion creates a lid on the lowest part of the atmosphere, making the air near the ground unusually stable and suppressing vertical mixing. Because warm air sits above cooler air, air near the surface can’t rise and disperse pollutants, so emissions from vehicles, industry, and other sources build up rather than dilute. With limited mixing, ground-level pollutant concentrations rise and smog can form, especially on sunny, stagnant days.

Inversions don’t enhance mixing, they inhibit it. They do have a real impact on air quality, and they don’t pull pollutants away from the city; they keep them near the surface where people breathe.