Which of the following is NOT regarded as a pollutant on land or in air?
Smoke
Nitrogen
Noise
Sulphur dioxide
Correct answer is B
Air Pollutants
The primary pollutants of concern in land and soil are heavy metals, such as lead, mercury and others, pesticides and other persistent organic pollutants, and pharmaceuticals, such as antibiotics used for livestock management.
Nitrogen (N), nonmetallic element of Group 15 [Va] of the periodic table.
It is a colourless, odourless, tasteless gas that is the most plentiful element in Earth's atmosphere and is a constituent of all living matter.