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Information about each monitoring location
Interactive map

Interactive map



 Find your nearest monitoring point on
My Spelthorne

Spelthorne diffusion tubes

SP1 SP9 SP17 SP25 SP33 SP41
SP2 SP10 SP18 SP26 SP34 SP42
SP3 SP11 SP19 SP27 SP35 SP43
SP4 SP12 SP20 SP28 SP36 SP44
SP5 SP13 SP21 SP29 SP37 SP45
SP6 SP14 SP22 SP30 SP38 SP46
SP7 SP15 SP23 SP31 SP39 SP47
SP8 SP16 SP24 SP32 SP40  

Highways Agency diffusion tubes
HA1
HA2
HA3

Continuous monitoring stations
M25/13
SUN/01
BAA/OAKS

Heathrow survey tubes (2010 only)
HSP01 HSP05 HSP09 HSP13 HSP17
HSP02 HSP06 HSP10 HSP14 HSP18
HSP03 HSP07 HSP11 HSP15 HSP19
HSP04 HSP08 HSP12 HSP16 HSP20