Air Quality (Scotland) Regulations 2000 (S.S.I No. 97 of 2000).
These Regulations prescribe the relevant period for the purpose a review to be conducted by Scottish local authorities under Part IV of the Environment Act 1995 of the quality of air within their area. That review has to consider the air quality for the time being and the likely future air quality within the “relevant period” (a period to be prescribed by Regulations). Such reviews have to be accompanied by an assessment of whether any prescribed air quality standards or objectives are being achieved or are likely to be achieved within the relevant period. These Regulations also set the air quality objectives to be achieved by the end of that period.