The Department for Levelling Up, Housing and Communities (DLUHC) does not hold data centrally on the location of authorised traveller sites. The Planning Policy for Traveller Sites states that Local Planning Authorities, when developing their Local Plan, should ensure that traveller sites are sustainable economically, socially and environmentally. Under the Local Air Quality Management Framework, as part of the Environment Act, all Local Authorities in England are required to assess air quality in their area. The Government does not hold centrally information on complaints for statutory nuisances. Section 78R of the Environmental Protection Act 1990 requires Local Authorities and the Environment Agency to keep a public register about contaminated land in their respective areas.