In metropolitan areas, the concentration of ozone in the atmosphere drops at night because __________.

Question

BlackTom AI · Accepted Answer

Question restatement: In metropolitan areas, the concentration of ozone in the atmosphere drops at night because __________.

Option 1: wind blows away the ozone at night
- While wind can transport air masses and move ozone around, this is not the primary reason ozone levels drop at night. Transport effects can mix ozone, but the production and destruction of ozone are more directly governed by photochemistry that requires sunlight.

Option 2: energy usage goes down at night
- Energy usage being lower at night has no direct causative link to ozone formation. Ozone production is tied to photochemical reactions, not to general energy consumption patterns.

Option 3: the formation of ozone requires sunlight
- This is the key concept. Ground-level (tropospheric) ozone forms from reactions involving nitrogen oxides (NOx) and volatile organic compounds (VOCs) in the presence of sunlight. In the absence of sunlight at night, these photochemical reactions slow dramatically or stop, causing the ozone concentration to drop.

Option 4: there are less cars on the road at night
- While traffic emissions contribute NOx and VOCs that drive ozone formation, simply having fewer cars does not explain the night-time drop as effectively as the absence of sunlight, which directly halts the photochemical production pathway.

Option 5: it is colder at night
- Temperature can influence reaction rates and atmospheric chemistry, but the dominant reason for the nightly decrease in ozone is the lack of sunlight that powers ozone-creating photochemistry, not temperature changes alone.

Summary: The most fundamental mechanism behind the night-time drop in metropolitan ozone is the dependence of its formation on sunlight, which initiates the photochemical reactions producing ozone.

In metropolitan areas, the concentration of ozone in the atmosphere drops at night because __________.单项选择题

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