Regulation 2 Definitions

In these Regulations—

• “action plan” (“cynllun gweithredu”) means an action plan required by regulation 11;

• “agglomeration” (“crynhoad”) has the meaning given in regulation 5(2);

• “air quality standards” (“safonau ansawdd aer”) means limit values, target values and long-term objectives;

• “alert threshold” (trothwy rhybuddio”) means an alert threshold set out in Schedule 3;

• “ambient air” (“aer amgylchynol”) means outdoor air in the troposphere, excluding work places;

• “assessment” (“asesu”) means any method used to measure, calculate, predict or estimate the concentration of a pollutant;

• “attainment date” (dyddiad cyrhaeddiad”) means a date by which—

  1. (a)

     a limit value is required to be attained; or

  2. (b)

     a target value should be attained, insofar as this is possible;

• “concentration” (“crynodiad”) means—

  1. (a)

     for pollutants other than Group B pollutants, the concentration of the relevant pollutant in ambient air; or

  2. (b)

     for Group B pollutants, the total content of the relevant pollutant in the PM₁₀ fraction in ambient air,

  and, in both cases, a reference to a concentration is to a concentration assessed by the National Assembly in accordance with these Regulations;

• “Group A pollutants” (“llygryddion Grŵp A”) means benzene, carbon monoxide, lead, nitrogen dioxide and oxides of nitrogen, PM₁₀ and sulphur dioxide;

• “Group B pollutants” (“llygryddion Grŵp B”) means arsenic, benzo(a)pyrene, cadmium and nickel and their compounds;

• “improvement plan” (“cynllun gwella”) means an improvement plan required by regulation 8;

• “information threshold” (“trothwy gwybodaeth”) means the information threshold set out in Part 2 of Schedule 3;

• “limit value” (“gwerth terfyn”) means a maximum permitted concentration of a Group A pollutant set out in Part 1 of Schedule 1;

• “long-term objective” (“amcan hirdymor”) means a maximum concentration of ozone set out in Part 4 of Schedule 1;

• “margin of tolerance” (“ffin goddefaint”) means an amount specified in Part 2 of Schedule 1 by which a limit value may be exceeded;

• “oxides of nitrogen” (ocsidau nitrogen”) means the sum of nitric oxide and nitrogen dioxide added as parts per billion and expressed as nitrogen dioxide in microgrammes per cubic metre;

• “ozone precursor substances” (rhagsylweddau osôn”) means substances which contribute to the formation of ground level ozone, as referred to by regulation 18(1);

• “PM_2·5” means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 2.5μm aerodynamic diameter;

• “PM₁₀” means particulate matter which passes through a size-selective inlet with a 50% efficiency cut-off at 10μm aerodynamic diameter, in relation to which, in the case of assessments of Group B pollutants, the inlet is defined in EN 12341;

• “pollutant” (“llygrydd”) means—

  1. (a)

     any Group A pollutant;

  2. (b)

     any Group B pollutant;

  3. (c)

     ozone; or

  4. (d)

     any pollutant to which Part 3 of these Regulations applies;

• “polycyclic aromatic hydrocarbons” (“hydrocarbonau aromatig polysyclig”) means—

  1. (a)

     those compounds listed at regulation 19(2); and

  2. (b)

     any other polycyclic aromatic hydrocarbons the National Assembly chooses to monitor under regulation 19(1)(b);

• “rural background station” (“gorsaf cefndir gwledig”) is to be interpreted in accordance with Part 3 of Schedule 5;

• “target value” (“gwerth targed”) means a maximum concentration of a Group B pollutant as set out in Part 3 of Schedule 1 or ozone as set out in Part 4 of that Schedule; and

• “zone” (“parth”) means one of the parts of the territory into which the National Assembly has divided Wales under regulation 5(1) for the purposes of Part 2 of these Regulations; and references to a zone, unless the context indicates otherwise, include an agglomeration.

Other words and expressions used in these Regulations have the same meaning as in the following Directives—