var la_markers = [{"data_source":"link","latitude":"51.520219","longitude":"-0.096323","site_id":"CT4","site_name":"Beech Street NOx","overall_index":"1","la_name":"City of London Corporation","la_id":"86","summary":"Low (Index 1)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.520177","longitude":"-0.096455","site_id":"CT4a","site_name":"Beech Street PM","overall_index":"2","la_name":"City of London Corporation","la_id":"86","summary":"Low (Index 2)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.510520","longitude":"-0.092130","site_id":"CTA","site_name":"Bell Wharf Lane","overall_index":"2","la_name":"City of London Corporation","la_id":"86","summary":"Low (Index 2)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.486884","longitude":"0.017902","site_id":"GR008","site_name":"Greenwich Woolwich Flyover","overall_index":"3","la_name":"London Borough of Greenwich","la_id":"193","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.516212","longitude":"-0.092238","site_id":"CT9","site_name":"Guildhall","overall_index":"1","la_name":"City of London Corporation","la_id":"86","summary":"Low (Index 1)","type":"Urban Background"},{"data_source":"link","latitude":"51.550056","longitude":"-0.063302","site_id":"HK010","site_name":"Hackney Amhurst Road","overall_index":"2","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 2)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.548267","longitude":"-0.067137","site_id":"HK014","site_name":"Hackney Dalston Lane","overall_index":"3","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 3)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.546263","longitude":"-0.069368","site_id":"HK016","site_name":"Hackney Graham Road","overall_index":"3","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 3)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.567094","longitude":"-0.094236","site_id":"HK013","site_name":"Hackney Green Lanes","overall_index":"1","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 1)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.548747","longitude":"-0.041881","site_id":"HK011","site_name":"Hackney Homerton Library","overall_index":"3","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 3)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.562992","longitude":"-0.058410","site_id":"HK015","site_name":"Hackney Northwold Road","overall_index":"3","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 3)","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.526454","longitude":"-0.084910","site_id":"HK006","site_name":"Hackney Old Street","overall_index":"3","la_name":"London Borough of Hackney","la_id":"194","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.539324","longitude":"-0.070078","site_id":"HK009","site_name":"Hackney Queensbridge Road","overall_index":"-1","la_name":"London Borough of Hackney","la_id":"194","summary":"This monitoring site closed on 20\/05\/2024","type":"Suburban Traffic"},{"data_source":"link","latitude":"51.569484","longitude":"0.082907","site_id":"LBRB007","site_name":"Redbridge Ley Street","overall_index":"3","la_name":"London Borough of Redbridge","la_id":"206","summary":"Low (Index 3)","type":"Urban Background"},{"data_source":"link","latitude":"51.511491","longitude":"-0.095807","site_id":"CT1","site_name":"Senator House","overall_index":"-1","la_name":"City of London Corporation","la_id":"86","summary":"This monitoring site closed on 15\/01\/2013","type":"Urban Background"},{"data_source":"link","latitude":"51.513873","longitude":"-0.077736","site_id":"CT3","site_name":"The Aldgate School","overall_index":"3","la_name":"City of London Corporation","la_id":"86","summary":"Low (Index 3)","type":"Urban Background"},{"data_source":"link","latitude":"51.515046","longitude":"-0.008418","site_id":"TH004","site_name":"Tower Hamlets - Blackwall","overall_index":"3","la_name":"London Borough of Tower Hamlets","la_id":"210","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.509477","longitude":"-0.050541","site_id":"TH005","site_name":"Tower Hamlets - King Edward Memorial Park","overall_index":"3","la_name":"London Borough of Tower Hamlets","la_id":"210","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.489134","longitude":"-0.012977","site_id":"TH001","site_name":"Tower Hamlets - Millwall Park","overall_index":"2","la_name":"London Borough of Tower Hamlets","la_id":"210","summary":"Low (Index 2)","type":"Urban Background"},{"data_source":"link","latitude":"51.522530","longitude":"-0.042155","site_id":"TH2P","site_name":"Tower Hamlets - Roadside","overall_index":"3","la_name":"London Borough of Tower Hamlets","la_id":"210","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.540519","longitude":"-0.033307","site_id":"TH002","site_name":"Tower Hamlets - Victoria Park","overall_index":"3","la_name":"London Borough of Tower Hamlets","la_id":"210","summary":"Low (Index 3)","type":"Urban Background"},{"data_source":"link","latitude":"51.509544","longitude":"-0.087357","site_id":"CT8","site_name":"Upper Thames Street","overall_index":"-1","la_name":"City of London Corporation","la_id":"86","summary":"This monitoring site closed on 13\/09\/2021","type":"Urban Traffic"},{"data_source":"link","latitude":"51.510499","longitude":"-0.091634","site_id":"CT6","site_name":"Walbrook Wharf","overall_index":"-1","la_name":"City of London Corporation","la_id":"86","summary":"This monitoring site closed on 08\/01\/2023","type":"Urban Traffic"},{"data_source":"link","latitude":"51.562376","longitude":"-0.004898","site_id":"WL1","site_name":"Waltham Forest Dawlish Rd","overall_index":"3","la_name":"London Borough of Waltham Forest","la_id":"211","summary":"Low (Index 3)","type":"Urban Background"},{"data_source":"link","latitude":"51.556239","longitude":"-0.013628","site_id":"WL5","site_name":"Waltham Forest Leyton","overall_index":"2","la_name":"London Borough of Waltham Forest","la_id":"211","summary":"Low (Index 2)","type":"Urban Background"}]
var sla_markers = [{"data_source":"link","latitude":"51.537598","longitude":"-0.002138","site_id":"NEW2","site_name":"Newham Cam Road","overall_index":"3","la_name":"London Borough of Newham","la_id":"205","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.533017","longitude":"0.055000","site_id":"NEW04","site_name":"Newham East Ham Town Hall","overall_index":"3","la_name":"London Borough of Newham","la_id":"205","summary":"Low (Index 3)","type":"Urban Traffic"},{"data_source":"link","latitude":"51.514727","longitude":"0.014554","site_id":"NEW3","site_name":"Newham Wren Close","overall_index":"3","la_name":"London Borough of Newham","la_id":"205","summary":"Low (Index 3)","type":"Urban Background"},{"data_source":"link","latitude":"51.514764","longitude":"0.011989","site_id":"NEW1","site_name":"Tant Avenue","overall_index":"-1","la_name":"London Borough of Newham","la_id":"205","summary":"This monitoring site closed on 14\/03\/2003","type":"Urban Background"}]
var aurn_markers = [
{"data_source": "link_archive","latitude": "51.522530","longitude": "-0.042155","la_id": "211","la_name": "London Borough of Tower Hamlets","site_id": "TH2","type": "Traffic","site_name": "Tower Hamlets Roadside","summary": "Low (Index 1)","overall_index": "1"},
]