Changes made by 2001/839/EC: Commission Decision of 8 November 2001 laying down a questionnaire to be used for annual reporting on ambient air quality assessment under Council Directives 96/62/EC and 1999/30/EC (Text with EEA relevance.) (notified under document number C(2001) 3405)
EU Decision 2001/839
No changes made by 2001/839/EC: Commission Decision of 8 November 2001 laying down a questionnaire to be used for annual reporting on ambient air quality assessment under Council Directives 96/62/EC and 1999/30/EC (Text with EEA relevance.) (notified under document number C(2001) 3405) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.