Discussion
Choose the correct concentration for the gases given in List-I generally found in the urban environment :
List-I : O3, CO2, CH4, CO
Answer: B
The correct sequence is 60 PPBV, 400 PPMV, 1.9 PPMV, 600 PPBV for O3, CO2, CH4 and CO.
Carbon dioxide is by far the most abundant of the four, about 400 parts per million by volume (it passed 400 ppm around 2015). Methane is about 1.9 ppm. Ozone and carbon monoxide are trace gases measured in parts per billion: urban ozone of the order of 60 ppb, and urban carbon monoxide a few hundred ppb, such as 600 ppb.
Each wrong option misplaces CO2: the first gives 400 ppm to ozone, the third gives it to methane, and the fourth gives 600 ppb to ozone and only 1.9 ppm to carbon monoxide while leaving methane at 40 ppb, far below its real level.
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