The correct option is A suspended particulate matter (SPM)
Atmospheric pollutants
In metropolitan cities like Delhi, the major pollutant present in the atmosphere is suspended particulate matter (SPM), which are microscopic particles or liquids suspended in the air.
These particles are released in the air through the combustion processes, industrial activities or natural sources and include dust, smoke, soot, pollen and soil particles.
Final answer (A) suspended particulate matter (SPM)