Computer · Environmental Engineering
What is the permissible maximum annual average concentration of SO2 for residential areas as per the National Ambient Air Quality Standards (NAAQS) in India?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1500 μg/m3 (equivalent to ~0.19 ppm at 15°C)
- 2200 μg/m3 (equivalent to ~0.079 ppm at 20°C)
- 380 μg/m3 (equivalent to ~0.029 ppm at 24°C)
- 450 μg/m3 (equivalent to ~0.019 ppm at 20°C)✓
Correct answer
50 μg/m3 (equivalent to ~0.019 ppm at 20°C)
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