https://www.charltonandjenrick.co.uk/news/2016/01/smoke-control-areas/
Smoke Control Areas & Smog | Charlton & Jenrick
smoke control areassmogcharlton
https://www.data.gov.uk/dataset/8ac57640-4e67-44e0-9202-032506ecb1fd/smoke-control-areas15
Smoke Control Areas - data.gov.uk
smoke control areasdatauk