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- How many major air pollutants do Air quality Index includes, as recently air quality of NCR cities Delhi, Gurugram and Noida gone into ‘very poor’ category?
Question 1:
How many major air pollutants do Air quality Index includes, as recently air quality of NCR cities Delhi, Gurugram and Noida gone into ‘very poor’ category? A. 6
B. 5
C. 4
D. 3
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