Monthly Diffusion Tube Readings

The results below show raw data, they are provisional and have not yet been annualised, bias adjusted or distance corrected, the data should be used for indicative purposes only. The adjusted results for this year will be used for the Annual Status Report for Air Quality (ASR) due to be completed in June/July 2026. The ASRs for previous years can be viewed below.

All periods of exposure are across four to five weeks, in accordance with DEFRA recommendations.

Monthly Readings 2026

Site Name	Location	X OS Grid Ref (Easting)	Y OS Grid Ref (Northing)	NO₂ Concentrations μg/m³
				Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
MV1	West Street, Dorking	516388	149366	19	17	22	17	15
MV2	Vincent Lane CH, Dorking	516273	148876	23	13	15	15	10
MV3	Lonsdale Road, Dorking	516869	149797	14	11	13	11	7
MV4	A24 Beare Green	517819	143055	15	21	22	18	5
MV5	Osbrooks Lodge, A24 Horsham Road, Capel	517227	138685	13	12	11	9	5
MV6	Surrey County Council Highways Depot	517210	157200	17	20	28	19	16
MV7	A25 Reigate Road, Betchworth	520204	150578	12	14	14	9	14
MV8	8 Russ Hill, Charlwood	523412	140582	13	13	15	11	9
MV9	Withey Meadows, Hookwood	526913	142369	14	13	11	11	19
MV10	Green Lane, Ashtead	517712	156744	14	22	22	19	14
MV11	Green Lane, Ashtead	517804	156751	13	17	19	13	6
MV12	Green Lane (Quarry Gardens)	517674	156840	14	16	18	14	14
MV13	Vincent Lane WS, Dorking	516120	149357	12	16	27	17	18
MV14	Pippbrook Council Offices, Dorking	517035	149805	15	21	19	11	13
MV15	Square About, Bookham	513483	154600	13	17	19	12	12
MV16	Cobham Road, Fetcham	514677	156557	15	18	19	12	14
MV17	Leret Road, Leatherhead	516763	156563	13	16	20	14	12
MV18	Deepdene Roundabout	517241	149847	16	25	33	20	25
MV19	Lowfield Heath Road	524909	140231	15	16	16	17	14

n/d – no data available