Regulation 2 Definitions

In these Regulations —

• “agglomeration” (“crynhoad”) means a zone with a population concentration in excess of 250,000 inhabitants or, where the population concentration is 250,000 or less, a population density per km² for which the National Assembly considers that the need for ambient air to be assessed or managed is justified;

• “alert threshold” (“trothwy rhybuddio”) means that level prescribed as such under regulation 6;

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

• “assessment” (“asesu”) means any method used to measure, calculate, predict or estimate the level of ozone or ozone precursor substances in the ambient air;

• “fixed measurement” (“mesuriadau sefydlog”) means measurements taken at fixed sites either continuously or by random sampling, the number of measurements being sufficiently large to enable the levels observed to be determined;

• “information threshold” (“trothwy gwybodaeth”) means that level prescribed as such under regulation 6;

• “level” (“lefel”) means the concentration of ozone or ozone precursor substances in ambient air;

• “local health board” (“bwrdd iechyd lleol”) has the meaning given in section 16BA of the National Health Service Act 1977^f1;

• “long-term objective” (“amcan hirdymor”) means that level prescribed as such under regulation 3(2);

• “National Assembly” (“Cynulliad Cenedlaethol”) means the National Assembly for Wales;

• “ozone precursor substances” (“rhagsywleddion osôn”) means substances which contribute to the formation of ground-level ozone, including those listed in Schedule 4;

• “the public” (“y cyhoedd”) includes health care bodies and organisations which represent the interests of sensitive populations, consumers and the environment and which have an interest in ambient air quality;

• “relevant averaging period” (“cyfnod cyfartaleddu perthnasol”) has the meaning prescribed in regulation 7(5);

• “rural background station” (“gorsaf cefndir gwledig”) has the meaning given by Part I of Schedule 2;

• “target value” (“gwerth targed”) means that level prescribed under regulation 3(1);

• “volatile organic compounds” (“cyfansoddion organig anweddol”) or “VOCs” (“VOCs”) means all organic compounds from anthropogenic and biogenic sources, other than methane, that are capable of producing photochemical oxidants by reaction with nitrogen oxides in the presence of sunlight; and

• “zone” (“parth”) means a part of Wales which is designated for the purposes of these Regulations and which is shown on a map published by the National Assembly on 10th June 2003, deposited at the offices of the National Assembly, Environmental Protection Division, Cathays Park, Cardiff CF10 3NQ.