Air Quality Index

The Air Quality Index is derived as follows:

Band Index Ozone (µg/m³)
8 HOUR MEAN		 Nitrogen Dioxide (µg/m³)
1 HOUR MEAN		 PM2.5 (µg/m³)
24 HOUR MEAN		 PM10 (µg/m³)
24 HOUR MEAN
Low 1 0 - 33 0 - 67 0 - 11 0 - 16
2 34 - 66 68 - 134 12 - 23 17 - 33
3 67 - 100 135 - 200 24 - 35 34 - 50
Moderate 4 101 - 120 201 - 267 36 - 41 51 - 58
5 121 - 140 268 - 334 42 - 47 59 - 66
6 141 - 160 335 - 400 48 - 53 67 - 75
High 7 161 - 187 401 - 467 54 - 58 76 - 83
8 188 - 213 468 - 534 59 - 64 84 - 91
9 214 - 240 535 - 600 65 - 70 92 - 100
Very High 10 241 or more 601 or more 71 or more 101 or more

Health Advice

The health advice associated with the Air Quality Index is as follows:

Band Index Health Advice for General Population Health Advice for At-Risk Groups
Low 1 Enjoy your usual outdoor activities. Enjoy your usual outdoor activities.
2
3
Moderate 4 Enjoy your usual outdoor activities. Adults and children with lung problems, and adults with heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors.
5
6
High 7 Anyone experiencing discomfort such as sore eyes, cough or sore throat should consider reducing activity, particularly outdoors.

Adults and children with lung problems, and adults with heart problems, should reduce strenuous physical activity, particularly outdoors, and particularly if they experience symptoms.

People with asthma may find they need to use their reliever inhaler more often. Older people should also reduce physical exertion.
8
9
Very High 10 Reduce physical exertion, particularly outdoors, especially if you experience symptoms such as cough or sore throat.

Adults and children with lung problems, adults with heart problems, and older people, should avoid strenuous physical activity.

People with asthma may find they need to use their reliever inhaler more often.