Which of the following air pollutants is not toxic to vegetation i.e., doesn't cause vegetation damage ?
Correct answer: C. Carbon monoxide
- A. Smog & ozone
- B. Hydrogen fluoride & nitrogen oxides
- C. Carbon monoxide
- D. Sulphur dioxide & spray of weed killers
Explanation
Carbon monoxide is highly toxic to humans because it binds haemoglobin, but it is generally not considered a major direct cause of vegetation injury. Ozone, sulphur dioxide, hydrogen fluoride, nitrogen oxides, and herbicide sprays can damage plants.
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