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CAQI Common Air Quality Index--update with PM(2.5) and sensitivity analysis.

Sef van den Elshout¹, Karine Léger², Hermann Heich³

¹DCMR Environmental Protection Agency Rijnmond, PO Box 843, 3100AV Schiedam, The Netherlands.

The Science of the Total Environment

|November 19, 2013

Summary

The Common Air Quality Index (CAQI) was developed to enable real-time air quality comparisons across European cities. This study details the CAQI

Keywords:

Air quality index PM(2.5)Public awareness Urban air quality

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Area of Science:

Environmental Science
Air Quality Monitoring
Public Health

Background:

Existing air quality indices lack standardization, hindering cross-city comparisons.
Real-time air quality data accessibility is crucial for public awareness and policy-making.
The need for a unified European air quality index to overcome data fragmentation.

Purpose of the Study:

To introduce and describe the Common Air Quality Index (CAQI) for European cities.
To detail the CAQI's calculation logic, including updates for PM2.5.
To assess the CAQI's performance and comparability using real-world data.

Main Methods:

Utilized 2006 Airbase data from 58 European monitoring stations (urban background and roadside).
Analyzed the CAQI's behavior before and after calculation scheme updates, including PM2.5.
Conducted a sensitivity analysis on pollutant inclusion and station type (street vs. urban background).

Main Results:

The CAQI provides a standardized metric for real-time air quality assessment in European cities.
The index effectively characterizes both roadside and urban background air quality situations.
Sensitivity analysis confirmed the CAQI's robustness and comparability across different pollutants and station types.

Conclusions:

The CAQI offers a vital tool for consistent, real-time air quality comparison across European urban areas.
Standardization through CAQI improves the basis for inter-city air quality analysis and public information.
The CAQI's design, incorporating specific pollutants and station types, enhances its utility for environmental monitoring.