Teaching BPSC बिहार प्राथमिक (1 to 5) शिक्षक भर्ती 4.0 Mock Test General Knowledge Ecology and Environment Environmental pollution
Which of the following is NOT a primary pollutant?
1
Ground level ozone
2
Volatile organic compunds
3
Nitrogen Oxides
4
More than one of the above
5
None of the above