OPSC OCS 2023 · Question 87 of 97
General Studies
Types of primary pollutants include: Nitrogen oxides (NOx) Carbon monoxide (CO) Volatile organic compounds (VOCs) Sulfur oxides (SOx) Particulate matter (PM) Mercury and more
Source: OPSC OCS Prelims 2023 GS Paper-I; answers per Apti Plus unofficial key
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