Correct Answer: (d) Sulphur Dioxide (SO₂), Nitrogen Dioxide (NO₂), Suspended Particulate Matter (PM₁₀), and Fine Particulate Matter (PM₂.₅)
Solution:Central Pollution Control Board (CPCB) is executing a nation-wide programme of ambient air quality monitoring known as the National Air Quality Monitoring Programme (NAMP). The network at present consists of 931 operating stations covering 398 cities/towns. The objectives of N.A.M.P. are to determine status and trends of ambient air quality; to ascertain whether the prescribed ambient air quality standards are violated; to identify non-attainment cities; to obtain the knowledge and understanding necessary for developing preventive and corrective measures and to understand the natural cleansing process undergoing in the environment through pollution dilution, dispersion, wind-based movement, dry deposition, precipitation, and chemical transformation of pollutants.