The Air Quality Standards (Wales) Regulations 2007 No. 717 (W. 63)

SCHEDULE 8 Data quality objectives

PART 1 Group A pollutants and PM_2·5

Benzene and carbon monoxide

8.  The uncertainty for modelling and objective estimation is defined as the maximum deviation of the measured and calculated concentration levels, over the period considered by the limit value, without taking into account the timing of the events.