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Real-time air quality
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— · — stations
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UK DAQI (1–10)
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Main pollutant: —
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Good
Moderate
Poor
Concentrations · DAQI averaging
24hr trend · PM2.5
Median of — stations
Index interpretations
UK DAQI
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1–10 scale. 24hr mean PM2.5/PM10, hourly NO₂/SO₂, 8hr O₃. Used by DEFRA and UK Met Office for public health guidance.
UK Air Quality Standards Regulations 2010 · DEFRA AURN Technical Report
US AQI
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0–500 scale. NowCast 12hr weighted mean for PM — higher sensitivity to short-term spikes than arithmetic averaging.
US EPA 40 CFR Part 58, Appendix G · EPA AQI Technical Assistance Document 2018
EU EAQI
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1–6 scale. EU Directive 2008/50/EC thresholds. Hourly instantaneous readings. Includes SO₂ as primary indicator.
EU Directive 2008/50/EC · EEA Air Quality Index methodology 2023
WHO guideline comparison
Methodology
DAQI
Academic citation
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Data sources