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並前往https://www2.illinois.gov/epa/topics/air-quality/air-quality-reports/Documents/2020AnnualAirQualityReport-Final.pdf

illinois annual air quality report 2020

0.070 ppm. Annual fourth-highest daily maximum 8-hr concentration, averaged over 3 years. Particle. Pollution. PM2.5 primary. Annual. 12.0 μg/m3.

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