Describe the key points of the revised Global Air Quality Guidelines (AQGs) recently released by the World Health Organisation (WHO). How are these different from its last update in 2005? What changes in India’s National Clean Air Programme are required to achieve these revised standards ?
Describe the key points of the revised Global Air Quality Guidelines (AQGs) recently released by the World Health Organisation (WHO). How are these different from its last update in 2005? What changes in India’s National Clean Air Programme are required to achieve these revised standards ?
The WHO released revised Global Air Quality Guidelines in 2021, marking the first update in 16 years amid growing evidence of air pollution's severe health impacts.
Key Features of WHO's Revised Guidelines (2021)
- Comprehensive Pollutant Coverage: Standards for six major pollutants - PM2.5, PM10, ozone (O3), nitrogen dioxide (NO2), sulfur dioxide (SO2), and carbon monoxide (CO)
- Interim Target Framework: Four progressive interim targets (IT-1 to IT-4) to guide countries with high pollution levels toward final guidelines
- Health Evidence Integration: Guidelines based on systematic reviews showing health impacts at lower concentrations than previously recognized
- Good Practice Statements: Recommendations for pollutants like ultrafine particles and black carbon where quantitative guidelines aren't feasible
- 24-hour and Annual Standards: Separate limits for short-term and long-term exposure across all pollutants
Major Changes from 2005 Guidelines
| Pollutant | 2005 Standard (μg/m³) | 2021 Standard (μg/m³) | Change |
|---|---|---|---|
| PM2.5 (Annual) | 10 | 5 | 50% reduction |
| PM10 (Annual) | 20 | 15 | 25% reduction |
| NO2 (Annual) | 40 | 10 | 75% reduction |
| Ozone (Peak season) | Not specified | 60 | New standard |
Required Changes in India's National Clean Air Programme
Policy Framework Enhancements:
- Target Revision: Upgrade from 40% PM10 reduction by 2025-26 to more ambitious targets aligning with WHO standards
- Legal Strengthening: Amendment of Air (Prevention and Control of Pollution) Act, 1981 to incorporate WHO standards
- Multi-pollutant Approach: Expand focus beyond PM10/PM2.5 to include NO2 and ozone monitoring
Implementation Mechanisms:
- Monitoring Infrastructure: Scale up from 344 to 1,000+ continuous ambient air quality monitoring stations by 2026
- Technology Integration: Deploy Internet of Things (IoT) sensors and satellite monitoring for real-time data
- Source-specific Action: Strengthen Graded Response Action Plan (GRAP) with sector-wise emission controls
Institutional Reforms:
- Coordination Enhancement: Establish National Air Quality Management Commission with enforcement powers
- Financing: Increase allocation under 15th Finance Commission recommendations for air quality management
India's current air quality levels exceed WHO guidelines by 3-5 times, requiring coordinated action across industrial emissions, vehicular pollution, and agricultural burning through strengthened Pollution Under Control (PUC) certification and BS-VI emission norms implementation.
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