The Air Quality Standards Regulations 1989, insofar as they apply to England:

S.I. 1989/317

Regulation 2(1) (limit values for sulphur dioxide and suspended particulates in the atmosphere)

1st January 2005

Regulation 4(1) (limit value for lead in air)

1st January 2005

Regulation 6 (limit value for nitrogen dioxide in the atmosphere)

1st January 2010

The Ozone Monitoring and Information Regulations

S.I. 1994/440

9th September 2003

The Air Quality Limit Values Regulations 2001

S.I. 2001/2315

9th September 2003

The Air Quality Limit Values (Amendment) Regulations 2002

S.I. 2002/3117

9th September 2003