Teaching Punjab Pre Primary Teacher Test Series 2020 General Knowledge Ecology and Environment Environmental pollution
Photochemical smog is a resultant of the reaction among
1
NO2, O3 and peroxyacetyl nitrate in the presence of sunlight
2
CO, O2 and peroxyacetyl nitrate in the presence of sunlight
3
CO, CO2 and NO2 at low temperature
4
high concentration of NO2, O3 and CO in the evening