UPSC Mains Answer: 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 st

Difficulty Level: Medium

Sub-category: Environment and Ecology (Environmental Pollution and Degradation)

Introduction

The World Health Organisation (WHO) recently revised its Global Air Quality Guidelines (AQGs) in 2021, marking a significant update after 16 years. These guidelines aim to protect public health by reducing exposure to air pollutants, reflecting advancements in scientific evidence linking air pollution to adverse health outcomes.

Body

Key Points of Revised AQGs:

Stricter limits for six major pollutants

PM2.5, PM10, ozone (O₃), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and carbon monoxide (CO).
PM2.5 annual limit halved from 10 µg/m³ to 5 µg/m³, and PM10 reduced from 20 µg/m³ to 15 µg/m³.
New interim targets introduced to guide countries in phased implementation, especially for regions with high pollution levels.
Emphasis on health equity, urging nations to prioritize vulnerable populations like children, the elderly, and those with pre-existing conditions.

Differences from 2005 Guidelines

2021 guidelines are more stringent, reflecting updated epidemiological research on long-term health impacts.
Inclusion of interim targets to facilitate gradual compliance in highly polluted regions.
Greater focus on NO₂, linked to respiratory diseases, with its annual limit reduced from 40 µg/m³ to 10 µg/m³.
Required Changes in India’s NCAP:
Align NCAP’s targets with WHO’s revised AQGs by adopting stricter annual and daily pollutant limits.
Expand monitoring networks to cover rural and peri-urban areas, currently underrepresented.
Strengthen enforcement of emission norms for industries, vehicles, and construction activities.
Promote cleaner fuels (e.g., BS-VI) and renewable energy adoption to reduce dependency on fossil fuels.
Enhance public awareness and community participation in air quality management.

Conclusion

The revised WHO AQGs underscore the urgent need for global action to combat air pollution. For India, aligning the National Clean Air Programme with these guidelines is critical to mitigating health risks and achieving sustainable development. Proactive policy reforms, technological innovation, and public engagement will be key to meeting these ambitious standards.