# The Air Quality (Ozone) (Wales) Regulations 2003, Paragraph 4


The sampler’s exhaust outlet should be positioned so as to avoid recirculation of exhaust gases to the sampler inlet.
The following factors may also be taken into account:
(a) interfering sources;
(b) security;
(c) access;
(d) availability of electrical power and telephone communications;
(e) visibility of the site in relation to its surroundings;
(f) safety of public and operators;
(g) the desirability of co-locating sampling points for different pollutants; and
(h) planning requirements.

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Source: https://www.legislation.gov.uk/wsi/2003/1848/schedule/2/paragraph/4 (the official version)
Page: https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-2/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.