Question : The ambient air quality standards (24 hours average) for lead in industrial areas are:
Option 1: 0.65 µg/m3
Option 2: 0.75 µg/m3
Option 3: 1.0 µg/m3
Option 4: 1.5 µg/m3
Correct Answer: 1.5 µg/m 3
Solution : The correct answer is 1.5 µg/m 3.
The ambient air quality standard for lead in an industrial area is specified as 1.5 µg/m³ for a 24-hour average, which means that the concentration of lead in the air should not exceed this limit over 24 hours to comply with the National Ambient Air Quality Standards (NAAQS).
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