PM2.5 and PM10 Particle Concentrations in µg/m³

The Defra (UK Government Department for Environment and Rural Affairs) DAQI Indices are based on the daily mean concentration for historical data, latest 24 hour running mean for the current day.

Index PM2.5 1 2 3 4 5 6 7 8 9 10
Band Low Low Low Moderate Moderate Moderate High High High Very High
µg/m³ 0-11 12-23 24-35 36-41 42-47 48-53 54-58 59-64 65-70 71 or more
Index PM10 1 2 3 4 5 6 7 8 9 10
Band Low Low Low Moderate Moderate Moderate High High High Very High
µg/m³ 0-16 17-33 34-50 51-58 59-66 67-75 76-83 84-91 92-100 101 or more