Which of the following can be considered as the best example of primary air pollutants?
A. Carbon dioxide released from burning of coal.
B. Sulphur trioxide.
C. Ozone produced in photochemical smog.
D. Carbon dioxide released through photosynthesis.
Answer:A
Which of the following can be considered as the best example of primary air pollutants?
A. Carbon dioxide released from burning of coal. B. Sulphur trioxide. C. Ozone produced in photochemical smog. D. Carbon dioxide released through photosynthesis.