Which of the following is not a direct cause of air pollution?
Which of the following is the main cause of global warming ?
(a) nitrogen dioxide
(b) sulphur dioxide
(c) carbon dioxide
(d) ozone
Which of the following causes global warming but is not an air pollutant?
Air pollution leads to global warming, acid rain, ozone depletion and a wide variety of respiratory diseases. Which of the following activities does not contribute to air pollution?