The Air Quality Limit Values (Wales) Regulations 2002 No. 3183 (W. 299)

SCHEDULE 1 LIMIT VALUES, MARGINS OF TOLERANCE ETC.

PART II NITROGEN DIOXIDE (NO₂) AND OXIDES OF NITROGEN (NO_x)

Limit values for nitrogen dioxide and oxides of nitrogen

2.1  

	Averaging period	Limit value	Margin of tolerance	Date by which limit value is to be met
1.  Hourly limit value for the protection of human health	1 hour	200 μg/m3 NO2, not to be exceeded more than 18 times a calendar year	70 μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010	1st January 2010
2.  Annual limit value for the protection of human health	Calendar year	40 μg/m3 NO2	14 μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010	1st January 2010
3.  Annual limit value for the protection of vegetation	Calendar year	30 μg/m3 NOx	None