Civil Services Uttarakhand Combined State Civil/Upper Subordinate Services Examination 2025 General Knowledge Ecology and Environment Environmental pollution
In the context pf PM2.5, what does 2.5 mean:
1
Particulate matter of size 2.5 μm
2
Particulate matter of average size 2.5 μm
3
Particulate matter of size 2.5 μm and less
4
None of these