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(A) In Indian metropolitan cities like Delhi,the primary source of air pollution is the combustion of fossil fuels in vehicles and industries.This pro

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Suspended particulate matter $(SPM)$

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(A) In Indian metropolitan cities like Delhi,the primary source of air pollution is the combustion of fossil fuels in vehicles and industries.This process releases a high concentration of $SPM$ (Suspended Particulate Matter),which consists of fine dust,smoke,and soot particles.According to the Central Pollution Control Board $(CPCB)$,$SPM$ of size $2.5$ micrometers or less in diameter $(PM_{2.5})$ is responsible for causing the greatest harm to human health.Therefore,$SPM$ is considered the major atmospheric pollutant in these cities.

In almost all Indian metropolitan cities like Delhi,the major atmospheric pollutant$(s)$ is/are

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