Question

which of these causes an occasional heavy buildup of air pollution in urban areas? increased amount of urban sunlight exposure increased oxygen levels in the atmosphere decreased pressure levels in the atmosphere pollution trapped by a temperature inversion

Explanation:

• For "increased amount of urban sunlight exposure": Sunlight exposure alone doesn't cause heavy air pollution buildup. In fact, sunlight can help in some chemical reactions that might break down pollutants (like in photochemical smog formation but not directly causing buildup).
• For "increased oxygen levels in the atmosphere": Higher oxygen levels would not lead to air pollution buildup. Oxygen is essential for life and doesn't contribute to pollution accumulation.
• For "decreased pressure levels in the atmosphere": Generally, decreased pressure might lead to air movement (like wind) which could disperse pollutants rather than cause a heavy buildup.
• For "pollution trapped by a temperature inversion": A temperature inversion occurs when a layer of warm air traps a layer of cooler air near the ground. This prevents the polluted air (from urban sources like vehicles, industries) from rising and dispersing, leading to a heavy buildup of air pollution in the urban area.

Answer:

D. pollution trapped by a temperature inversion