Photochemical smog is a resultant of the reaction among
[UPSC Civil Services Exam – 2013 Prelims]
(a) NO2, O3 and peroxyacetyl nitrate in the presence of sunlight
(b) CO, O2 and peroxyacetyl nitrate in the presence of sunlight
(c) CO, CO2 and NO2 at low temperature
(d) High concentration of NO2, O3 and CO in the evening
- Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities.
- It tends to occur more often in summer, because that is when we have the most sunlight.