Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?

A. Automobile exhaust
B. Blanketing effect of CO2 in the atmosphere
C. De-forestation
D. Thickening of ozone layer

A. 1 to 2
B. 4 to 5
C. 9 to 10
D. 15 to 20

A. Hydrogen
B. Acetylene
C. Carbon monoxide
D. Ammonia

A. Radioactive
B. Organic
C. Inorganic
D. None of these

A. Dermatitis (skin disorder)
B. Cancer
C. Asphyxiation
D. Asthma

A. 1
B. 3
C. 7
D. 20