Which of the following will be reduced in air in a city forest when a lot of dust and fly ash in emitted by a coal-based factory in the vicinity?
A. nitrogen
B. carbon dioxide
C. oxygen
D. water vapour
Answer:C
Which of the following will be reduced in air in a city forest when a lot of dust and fly ash in emitted by a coal-based factory in the vicinity?
A. nitrogen B. carbon dioxide C. oxygen D. water vapour