The Air Quality Standards Regulations (Northern Ireland) 2007

Fixed and combined measurement

14.—(1) Where the Department assesses concentrations of a Group A or Group B pollutant by fixed measurement or by combined measurement it shall ensure that—

(a) measurements of the relevant pollutant are taken at sampling points either continuously or by random sampling, subject, in the case of nitrogen dioxide, to the requirements imposed by regulation 15(7); and

(b) the number of measurements is sufficiently large to enable concentrations of that pollutant to be properly determined.

(2) Where the Department assesses concentrations of a Group A or Group B pollutant by fixed measurement, it may supplement information from sampling points for fixed measurement with information from modelling techniques in so far as it considers this will provide an adequate level of information on ambient air quality.

(3) Where the Department assesses concentrations of ozone by fixed measurement—

(a) it shall ensure that—

(i) the measurements are taken at fixed sites continuously; and

(ii) the number of measurements is sufficiently large to enable concentrations to be properly determined;

and

(b) it may supplement information from sampling points with information from modelling techniques or indicative measurements.