Questions and Answers
What is the annual standard concentration of Sulphur Dioxide in µg/m3 for residential areas?
50 µg/m3
How does the 24-hour standard for Nitrogen Dioxide differ for industrial and residential areas?
Both industrial and residential areas have a 24-hour standard of 80 µg/m3.
What is the standard concentration of Particulate Matter for sensitive areas on an annual basis?
60 µg/m3
Which method is used to measure Sulphur Dioxide concentration according to the standards?
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What is the standard concentration of Nitrogen Dioxide in µg/m3 for ecologically sensitive areas on an annual basis?
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Study Notes
National Ambient Air Quality Standards (NAAQS)
- Revised NAAQS were notified on 18th November 2009, establishing concentration limits for pollutants in ambient air.
- Standards apply to different areas categorized as Industrial, Residential, Sensitive, Rural, and Ecological.
Sulphur Dioxide (SO2)
-
Annual Average:
- Industrial areas: 50 µg/m³
- Residential and Sensitive Areas: 20 µg/m³
-
24 Hour Average:
- Applicable for all area types: 80 µg/m³
-
Measurement Methods:
- Improved West and Gaeke method
- Ultraviolet Fluorescence
Nitrogen Dioxide (NO2)
-
Annual Average:
- Industrial areas: 40 µg/m³
- Residential and Sensitive Areas: 30 µg/m³
-
24 Hour Average:
- Applicable for all area types: 80 µg/m³
-
Measurement Methods:
- Modified Jacob & Hochheiser method
- Chemiluminescence
Particulate Matter
-
Annual Average:
- Unified limit of 60 µg/m³ for all area types
-
Measurement Method:
- Gravimetric method
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Description
Test your knowledge on the Revised National Ambient Air Quality Standards (NAAQS) as notified on November 18, 2009. This quiz covers pollutants, their concentrations in different areas, and methods of measurement. Challenge yourself to understand the standards that govern air quality management.
