What was observed within a period of 1997 and 2005 in Delhi as regards to air quality ?
A. There was net increase in all the types of air pollutants.
B. Delhi became totally pollution-free during this period only.
C. There was substantial fall in concentrations of CO2 and SO2.
D. There was decrease in the concentration of H2S and CO.
Answer:C
What was observed within a period of 1997 and 2005 in Delhi as regards to air quality ?
A. There was net increase in all the types of air pollutants. B. Delhi became totally pollution-free during this period only. C. There was substantial fall in concentrations of CO2 and SO2. D. There was decrease in the concentration of H2S and CO.