2026空气质量指数报告_关键考量与最佳实践路线图_66页_1mb

报告摘要

Summary of "Air Quality Indexes: Key Considerations and Roadmaps for Best Practices"

Core Content

Air quality indexes (AQIs) are essential tools for communicating air pollution levels and associated health risks to the public. This report provides a comprehensive analysis of conventional and health-based AQIs, emphasizing the need for improved practices in their development, validation, and communication to better protect public health.

Main Points

1. Types of AQIs

Conventional AQIs are based on the concentration of a single pollutant that most exceeds its regulatory standard.
Health-based AQIs (AQHIs) consider the combined health risks from multiple pollutants, derived from concentration-response functions based on epidemiological evidence.

2. Health Impacts of Air Pollution

WHO estimates that ambient air pollution causes 4.2 million deaths annually and results in a loss of 105.2 million disability-adjusted life years.
Long-term exposure to PM₂.₅ is linked to five major diseases: acute lower respiratory infections, chronic obstructive pulmonary disease, ischaemic heart disease, stroke, and lung cancer.
Even short-term increases in air pollution levels (e.g., 24-hour spikes) can lead to acute health risks, with 1 million deaths annually attributed to PM₂.₅ alone.

3. Current AQI Practices

AQI values are unitless numbers that represent air quality or health risks on a standardized scale (e.g., 0–500).
AQIs are used to communicate public health risks and guide behavioral changes to reduce exposure.
AQI categories (e.g., good, moderate, high) help in conveying the level of risk and the need for precautionary measures.

4. Limitations of Conventional AQIs

They fail to capture cumulative or synergistic effects of multiple pollutants.
They may misrepresent health risks due to reliance on single pollutants and regulatory thresholds, which can be influenced by non-health factors.
They are not suitable for long-term exposure assessment, as they focus on short-term fluctuations.

5. Advantages of Health-Based AQIs

Reflect multi-pollutant health risks and are derived from epidemiological evidence.
Provide more accurate health risk communication, especially for vulnerable populations.
Include specific health messages tailored to different groups, such as people with asthma, CVD, pregnant women, and children.

6. Key Considerations for Best Practices

Development: AQIs should be based on scientific evidence, multi-pollutant data, and local health profiles.
Communication: Improve health literacy and environmental health literacy to ensure the public can understand and act on AQI information.
Validation: Ensure that AQIs are accurate, reliable, and equity-sensitive, reflecting diverse environmental and health contexts.
Global Equity: Address disparities in air quality and health risks across regions, particularly in low- and middle-income countries, where PM₂.₅ levels are three times higher than in high-income countries.

Key Recommendations

Adopt locally adapted, equity-sensitive health-based AQIs to reflect diverse air pollution profiles and health susceptibilities.
Strengthen risk communication through improved indexes and innovative strategies.
Ensure multi-pollutant consideration in AQI formulations to better capture cumulative health risks.
Promote public participation and access to information to enhance community awareness and health outcomes.

Conclusion

Health-based AQIs offer significant advantages over conventional AQIs by more accurately reflecting multi-pollutant health risks and public health impacts. The report concludes that improved AQI communication and equity-sensitive approaches are critical to advancing public health protection. It also highlights the role of the health sector in disseminating evidence-based risk communication and the importance of global collaboration in addressing air pollution.

Key Information

WHO estimates: 4.2 million deaths and 105.2 million DALYs lost annually due to ambient air pollution.
PM₂.₅ is the most significant contributor to these health impacts.
AQI breakpoints are often arbitrary and based on (inter)national standards.
Health-based AQIs are more reflective of real-world health risks and are recommended for future development.
Global equity is emphasized, particularly in low- and middle-income countries.
AQI development should be science-based, multi-pollutant, and user-focused.

References

WHO Regional Office for Europe: 2023 report on AQI variations.
WHO: Updated roadmap for global response to air pollution (2025).
EU Directive (2024/2881): Ambient air quality and cleaner air for Europe.
Published epidemiological studies on short-term and long-term health effects of air pollution.
Examples of AQIs from Canada, United States, and United Kingdom.

Roadmaps for Best Practices

Development: Use multi-pollutant data, epidemiological evidence, and local health profiles.
Communication: Enhance health literacy, use clear and accessible formats, and provide behavioral guidance.
Validation: Ensure accuracy and reliability, and conduct external reviews.
Global Equity: Promote equitable access to information, local adaptation, and inclusive policy-making.