Air Quality Index for Health

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

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.