Civil Services HPPSC (Himachal Pradesh) HPAS Mock Test 2021 People Development & Environment Environmental Issues Pollution
Which of the following concentrations of Ozone in ambient air is considered good ?
1
Upto 0.06 ppm
2
Upto 0.18 ppm
3
Upto 0.15 pp
4
Upto 0.20 ppm