Search Legislation

The Air Quality Limit Values (Wales) Regulations 2002

Status:

This is the original version (as it was originally made).

PART IUpper and lower assessment thresholds

The following upper and lower assessment thresholds will apply:

SULPHUR DIOXIDE

Health protectionEcosystem protection
Upper assessment threshold60% of 24-hour limit value (75 μg/m3, not to be exceeded more than 3 times in any calendar year)60% of winter limit value (12 μg/m3)
Lower assessment threshold40% of 24-hour limit value (50 μg/m3), not to be exceeded more than 3 times in any calendar year)40% of winter limit value (8 μg/m3)

NITROGEN DIOXIDE AND OXIDES OF NITROGEN

Hourly limit value for the protection of human health (NO2)Annual limit value for the protection of human health (NO2)Annual limit value for the protection of vegetation (NOx)
Upper assessment value70% of limit value (140 μg/m3, not to be exceeded more than 18 times in any calendar year)80% of limit value (32 μg/m3)80% of limit value (24 μg/m3)
Lower assessment value50% of limit value (100 μg/m3, not to be exceeded more than 18 times in any calendar year).65% of limit value (26 μg/m3)65% of limit value (19.5 μg/m3)

PARTICULATE MATTER(1)

24-hour averageAnnual average
Upper assessment threshold60% of limit value (30 μg/m3, not to be exceeded more than seven times in any calendar year).70% of limit value (14 μg/m3)
Lower assessment threshold40% of limit value (20 μg/m3, not to be exceeded more than seven times in any calendar year).50% of limit value (10 μg/m3)

LEAD

Annual average
Upper assessment threshold70% of limit value (0.35 μg/m3)
Lower assessment threshold50% of limit value (0.25 μg/m3)

BENZENE

Annual average
Upper assessment threshold70% of limit value (3.5 μg/m3)
Lower assessment threshold40% of limit value (2 μg/m3)

CARBON monoxide

Eight-hour average
Upper assessment threshold70% of limit value (7 mg/m3)
Lower assessment threshold50% of limit value (5 mg/m3)
(1)

The upper and lower assessment thresholds for PM10 are based on the indicative limit values for 1 January 2010, which will be reviewed in the light of further information on health and environmental effects, technical feasibility and experience in the application of the existing “Stage 1” limit values. See Article 10 of Directive 99/30/EC.

Back to top

Options/Help

Print Options

Close

Legislation is available in different versions:

Latest Available (revised):The latest available updated version of the legislation incorporating changes made by subsequent legislation and applied by our editorial team. Changes we have not yet applied to the text, can be found in the ‘Changes to Legislation’ area. The revised version is currently only available in English.

Original (As Enacted or Made) - English: The original English language version of the legislation as it stood when it was enacted or made. No changes have been applied to the text.

Original (As Enacted or Made) - Welsh:The original Welsh language version of the legislation as it stood when it was enacted or made. No changes have been applied to the text.

Close

Opening Options

Different options to open legislation in order to view more content on screen at once

Close

More Resources

Access essential accompanying documents and information for this legislation item from this tab. Dependent on the legislation item being viewed this may include:

  • the original print PDF of the as enacted version that was used for the print copy
  • lists of changes made by and/or affecting this legislation item
  • confers power and blanket amendment details
  • all formats of all associated documents
  • correction slips
  • links to related legislation and further information resources
Close

More Resources

Use this menu to access essential accompanying documents and information for this legislation item. Dependent on the legislation item being viewed this may include:

  • the original print PDF of the as made version that was used for the print copy
  • correction slips

Click 'View More' or select 'More Resources' tab for additional information including:

  • lists of changes made by and/or affecting this legislation item
  • confers power and blanket amendment details
  • all formats of all associated documents
  • links to related legislation and further information resources