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?

Introduction

The World Health Organisation (WHO) released its revised Global Air Quality Guidelines (AQGs) in 2021, updating the 2005 standards. These guidelines aim to provide evidence-based thresholds for air pollutants to safeguard public health. The revision reflects growing scientific evidence linking air pollution to adverse health outcomes, even at lower concentrations than previously understood.

Key Points of the Revised WHO Global Air Quality Guidelines (AQGs)

• Stricter Thresholds for Key Pollutants:

  • PM2.5: Annual mean reduced from 10 µg/m³ (2005) to 5 µg/m³.
  • PM10: Annual mean reduced from 20 µg/m³ to 15 µg/m³.
  • NO₂: Annual mean reduced from 40 µg/m³ to 10 µg/m³.
  • Ozone (O₃): 8-hour mean reduced from 100 µg/m³ to 60 µg/m³.

• Focus on Health Impacts: The guidelines emphasize the health burden of air pollution, which contributes to 7 million premature deaths annually (WHO, 2021).

• Interim Targets: Introduced stepwise targets to help countries transition towards achieving the stricter AQGs.

• Global Applicability: The guidelines are designed to be adaptable across low-, middle-, and high-income countries, considering varying capacities and pollution levels.

Value Addition Block — Comparison of 2005 vs. 2021 AQGs

Differences Between 2005 and 2021 Guidelines

• Stricter Standards: The 2021 guidelines significantly lower permissible limits for pollutants like PM2.5, PM10, NO₂, and O₃, reflecting new evidence on health risks.
• Inclusion of Interim Targets: Unlike 2005, the 2021 guidelines provide stepwise targets to help countries gradually reduce pollution levels.
• Focus on Vulnerable Groups: Greater emphasis on protecting children, elderly, and those with pre-existing conditions.
• Global Health Context: The 2021 guidelines align with the Sustainable Development Goals (SDGs), particularly SDG 3 (Good Health and Well-being) and SDG 11 (Sustainable Cities and Communities).

Changes Required in India's National Clean Air Programme (NCAP)

India's NCAP, launched in 2019, aims to reduce PM2.5 and PM10 levels by 20-30% by 2024 (baseline: 2017). However, achieving the revised WHO AQGs necessitates significant reforms:

1. Stricter Targets and Timelines

• Current NCAP targets are less ambitious compared to the revised AQGs.
• Need to align with WHO's interim targets as a roadmap towards achieving the final thresholds.

2. Enhanced Monitoring Infrastructure

• Expand the air quality monitoring network to cover rural and semi-urban areas.
• Incorporate real-time monitoring for pollutants like O₃ and NO₂, which are under-monitored.

3. Sector-Specific Interventions

• Transport: Accelerate adoption of electric vehicles (EVs) and improve public transport.
• Industry: Enforce stricter emission norms for thermal power plants and industries.
• Agriculture: Promote alternatives to stubble burning, such as bio-decomposers and crop diversification.

4. Community Participation

• Raise awareness about the health impacts of air pollution.
• Encourage citizen-led initiatives like low-emission zones and urban greening.

5. Policy Integration

• Integrate NCAP with other national policies like the National Electric Mobility Mission Plan and National Solar Mission to ensure a multi-sectoral approach.

6. Increased Budgetary Allocation

• Allocate more funds for research, capacity building, and implementation of clean air technologies.

Conclusion

The revised WHO AQGs underscore the urgent need for countries, including India, to adopt stricter air quality standards to protect public health. Aligning India's NCAP with these guidelines will not only reduce the health burden but also contribute to achieving SDG 3 and SDG 11. A collaborative, multi-sectoral approach is essential to ensure cleaner air and a healthier future.