A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen dioxide
D. Sulfur dioxide
E. Methane
Choose the correct answer from the options given below :
The correct answer is Option 1 – A, C & D.
Explanation:
In India, the Air Quality Index (AQI) is calculated based on specific key air pollutants identified by the Central Pollution Control Board (CPCB). These include:
Carbon monoxide (CO) → Included ✔️
Nitrogen dioxide (NO₂) → Included ✔️
Sulfur dioxide (SO₂) → Included ✔️
Why others are incorrect:
Carbon dioxide (CO₂) → Not used in AQI calculation (it is a greenhouse gas, not a direct air pollutant for AQI)
Methane (CH₄) → Not included in AQI
So, the correct set is A, C, and D only.
Important Questions from Environmental Pollution and Control
A tributary flowing at a rate of 4 m3/s converges into a river flowing at a rate of 8.0 m3/s. The concentration of a pollutant 'X' at the upstream of the tributary before convergence was 12 mg/L and that of the river was 30 mg/L. If the pollutant X is completely mixed in the downstream, what would be its concentration?
Consider Gaussian-point source dispersion model with effective stack height H and dispersion coefficient σz = \(\frac{H}{\sqrt2}\). If the effective stack height H increases by 10%, the downwind ground-level concentration of pollutants would
In the two lists given below, List I provides the list of Pollutants, while List II indicates Health Effects. Match the two lists and choose the correct answer from the code given below :
List - I
(Pollutant)
List - II
(Health Effect)
(a) SO2 (i) Nerve and blood effects (b) O 3 (ii) Bronchitis
(c) CO
(iii) Asphyxiant (d) Pb
(iv) Pulmonary injury The online monitoring technique for NOx is based on the Chemiluminiscence of which of the following molecules in excited state?
A 500 MW coal based power station is operating at an efficiency of 30%. If the coal has 1% of sulphur content and 1 tonne of coal produces 8000 kWh energy, how much SO2 will be emitted daily by the plant?
