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Which of the following is not properly matched?

1. Formaldehyde - Carcinogenic
2. Sulphur dioxide - Respiratory problems
3. Nitrogen oxide - Brown air
4. Photochemical smog - Green air

Correct answer: Photochemical smog - Green air

Solution

Photochemical smog is associated with brownish haze, not green air. The other pairs are standard matches: formaldehyde is carcinogenic, sulphur dioxide causes respiratory irritation, and nitrogen oxides contribute to brown air.

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