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LAQN Pollution Levels
Broxbourne (Roadside) (closed)
Hertsmere - Borehamwood (Level 3)
Watford (Roadside) (closed)
Watford - Watford Town Hall (Level 2)
Enfield 2 - Church Street (closed)
Hertsmere Bwood 1 (Background) (closed)
Enfield 1 - Bushhill Park (closed)
Enfield 3 - Salisbury Sch Ponders End (closed)
Three Rivers - Rickmansworth (no data)
Brentwood - Brentwood Town Hall (Level 1)
Waltham Forest 3 - Chingford (closed)
Enfield - Derby Road (Level 2)
Harrow - Stanmore (Level 1)
Barnet - Tally Ho Corner (no data)
Enfield - Bowes Primary School (Level 1)
Havering 2 - Harold Hill (closed)
Haringey 3 - Bounds Green (closed)
Waltham Forest - Crooked Billet (Level 2)
Barnet 3 - Strawberry Vale (closed)
Haringey - Haringey Town Hall (Level 2)
Redbridge - South Woodford (no data)
Redbridge - Fullwell Cross (Level 1)
Barnet - Finchley (no data)
Brent - Kingsbury (Level 3)
Harrow - Pinner Road (Level 1)
Haringey - Priory Park (Level 1)
Redbridge - Gardner Close (Level 1)
Havering - Romford (Level 1)
Redbridge - Perth Terrace (no data)
Barking and Dagenham - Rush Green (no data)
Waltham Forest 2 - Mobile (closed)
Waltham Forest - Dawlish Road (no data)
Redbridge 2 - Ilford Broadway (closed)
Islington 4 - Foxham Gardens (closed)
Hackney - Clapton (Level 2)
Islington - Arsenal (Level 1)
Waltham Forest - Leyton (Level 1)
Brent 2 - Ikea Car Park (closed)
Islington - Holloway Road (Level 1)
Brent - Ikea (Level 2)
Brent - Neasden Lane (Level 1)
Hillingdon - South Ruislip (no data)
Camden - Swiss Cottage (Level 1)
Barking and Dagenham - North Street (Level 1)
Ealing 10 - Greenford (closed)
Islington 1 - Upper Street (closed)
Newham - Cam Road (Level 1)
Brent - John Keble Primary School (Level 1)
Brent 3 - Harlesden (closed)
Brent - St Marys Primary School (Level 1)
Barking and Dagenham - Scrattons Farm (Level 1)
Islington 5 - Duncan Terrace (closed)
Hammersmith and Fulham 3 - Scrubs Lane (closed)
Ealing - Hanger Lane Gyratory (no data)
Tower Hamlets - Bethnal Green (closed)
Marylebone Rd - Baker St Kerbside (closed)
Hackney - Old Street (Level 2)
Havering - Rainham (Level 1)
Westminster - Marylebone Road FDMS (Level 1)
Tower Hamlets 2 - Mile End Rd (closed)
Tower Hamlets - Mile End Road (Level 1)
Westminster - Marylebone Road (Level 2)
Camden - Bloomsbury (Level 2)
Hillingdon - Hillingdon Hospital (no data)
Ealing 9 - Court Way Acton (closed)
Camden - St Martins College (NOX 2) (Level 1)
City of London 4 - Beech Street (closed)
Kensington and Chelsea - North Ken (Level 2)
Kensington and Chelsea - North Ken FDMS (no data)
Camden - St Martins College (NOX 1) (no data)
Tower Hamlets - Blackwall (Level 2)
Newham 1 - Tant Avenue (closed)
Newham - Wren Close (Level 3)
Ealing - Horn Lane (Level 3)
Camden - Shaftesbury Avenue (Level 2)
City of London 2 - Farringdon Street (closed)
City of London - Sir John Cass School (no data)
Bexley - Thamesmead (no data)
Westminster - Covent Garden (no data)
City of London - Senator House (no data)
City of London - Walbrook Wharf (no data)
Tower Hamlets - Poplar (Level 3)
Ealing - Ealing Town Hall (Level 2)
Westminster - Charing Cross Library (no data)
City of London - Upper Thames Street (no data)
Ealing - Southall (no data)
Ealing - Acton Town Hall (Level 1)
Ealing - Acton Town Hall FDMS (no data)
Kensington and Chelsea - Knightsbridge (no data)
Kensington and Chelsea - Cromwell Road (Level 2)
Victoria Street - TRL (closed)
Hammersmith and Fulham 2 - Brook Green (closed)
Kensington and Chelsea - Earls Court Rd (no data)
Westminster - Horseferry Road (Level 2)
Greenwich - Millennium Village (Level 1)
Bexley - Belvedere (Level 2)
Bexley - Belvedere FDMS (Level 2)
West London - AURN (closed)
Bridge Place - AURN (closed)
Greenwich - A206 Burrage Grove (Level 2)
Hillingdon - Sipson Road (no data)
Kensington and Chelsea - Kings Road (Level 1)
Hounslow 1 - Brentford (closed)
Hounslow - Chiswick High Road (no data)
Southwark 1 - Elephant and Castle (closed)
Greenwich - Plumstead High Street (Level 2)
Hammersmith and Fulham 1 - Broadway (closed)
Greenwich - Woolwich Flyover (Level 2)
Lambeth 2 - Vauxhall Cross (closed)
Lambeth - Bondway Interchange (Level 2)
Greenwich - Trafalgar Road (Level 1)
Thurrock 2 - Purfleet (closed)
Hillingdon - Harlington (no data)
Hounslow - Brentford (Level 1)
Thurrock - London Road (Grays) (Level 3)
Hounslow 3 - Brentford (closed)
Southwark 2 - Old Kent Road (closed)
Lewisham - Mercury Way (no data)
Bexley 5 - Bedonwell (closed)
Bexley - Erith (Level 3)
Thurrock - London Road (Purfleet) (no data)
Richmond - Castelnau (Level 1)
Hounslow - Cranford (Level 1)
Hillingdon - Oxford Avenue (no data)
Lewisham - New Cross (Level 2)
Hounslow - Heston Road (no data)
Heathrow Airport (no data)
Greenwich - Blackheath (Level 2)
Richmond - Barnes Wetlands (no data)
Bexley - Slade Green FDMS (no data)
Bexley - Slade Green (Level 1)
Bexley - Thames Road North FDMS (Level 2)
Bexley - Thames Road North (Level 3)
Lambeth - Brixton Road (Level 2)
Lambeth - Loughborough Junct (Level 1)
Wandsworth - Putney High Street (no data)
Greenwich and Bexley - Falconwood FDMS (Level 2)
Greenwich and Bexley - Falconwood (Level 2)
Bexley - Thames Road South (Level 2)
Hounslow - Hatton Cross (no data)
Wandsworth - Town Hall (Level 2)
Greenwich - Westhorne Avenue (Level 2)
Greenwich - Eltham (Level 3)
Dartford Roadside 1 - St Clements (no data)
Wandsworth 3 - Roehampton (closed)
Wandsworth 1 - Garett Lane (no data)
Wandsworth 4 (FDMS) - High Street (closed)
Wandsworth 4 - High Street (closed)
Dartford Roadside 2 - Town Centre (no data)
Lewisham - Catford (Level 2)
Hounslow - Feltham (Level 1)
Lambeth - Christchurch Road (Level 1)
Dartford Roadside 3 - Bean Interchange (no data)
Lambeth - Streatham Green (no data)
Crystal Palace - Crystal Palace Parade (Level 1)
Wandsworth 6 - Tooting (closed)
Richmond - National Physical Laboratory (Level 3)
Bromley Rent office (closed)
Kingston 2 - Town Centre (closed)
Croydon - Norbury (Level 2)
Bromley - Harwood Avenue (Level 1)
Croydon - Thornton Heath (Level 3)
Richmond - Hampton Court Road (no data)
Bromley 4 - Tweedy Rd (closed)
Merton - Morden Civic Centre (no data)
Elmbridge - Hampton Court Parade (no data)
Sevenoaks 1 (closed)
Sutton - Beddington Lane (Level 1)
Sutton - Therapia Lane (Level 3)
Elmbridge - Walton High Street (no data)
Croydon 6 - Euston Road (closed)
Sutton - Worcester Park (Level 1)
Sutton 2 - North Cheam (closed)
Croydon - George Street (Level 1)
A3 - AURN (closed)
Elmbridge - Bell Farm Hersham (no data)
Elmbridge - Esher High Street (no data)
Sutton 1 - Town Centre (closed)
Sutton - Carshalton (Level 3)
Croydon - Purley Way (no data)
Sutton - Wallington (Level 1)
Kingston 1 - Chessington (closed)
Bromley - Biggin Hill (Level 2)
Mole Valley 2 - Lower Ashtead (closed)
Mole Valley 1 - Leatherhead (closed)
Sevenoaks - Greatness Park (Level 1)
Sevenoaks - Bat and Ball (Level 1)
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Air pollution levels recorded on Wednesday 10 March 2010, 11:00-12:00GMT
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How the bands are calculated
This map shows the latest hourly readings downloaded from LAQN pollution analysers. Not all analysers on the network are contacted every hour, so some sites may show 'no data'. Data have undergone automatic validity checks.
You can find out more information about each location (monitoring site) by clicking on its dot on the map. Once selected you can find out further information by clicking the 'Site Details' link above.

Click the 'Statistics' link above to see results from this site compared to national limit values. Past pollution episodes can be seen by clicking on the 'Episodes' link.

Alternatively, click on the button below to see a graph of this week's pollution levels.
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