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The Air Quality Limit Values (Scotland) Regulations 2003

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1.6  The following data quality objectives, for allowed uncertainty of assessment methods, of minimum time coverage and of data capture of measurement are provided to guide quality assurance programmes.

BenzeneCarbon monoxide
Fixed measurements
Uncertainty25%15%
Minimum data capture90%90%
Minimum time coverage35% urban background and traffic sites (distributed over the year to be representative of various conditions for climate and traffic)
90% industrial sites
Indicative measurements
Uncertainty30%25%
Minimum data capture90%90%
Minimum time coverage14% (one day’s measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year)14% (one measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year)
Modelling
Uncertainty50%
Eight-hour averages Annual averages50%
Objective estimation
Uncertainty100%75%

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