xmlns:atom="http://www.w3.org/2005/Atom"
1.1 The following data-quality objectives for the required accuracy of assessment methods, of minimum time coverage and of data capture of measurement are laid down to guide quality-assurance programmes.
Sulphur dioxide, nitrogen dioxide and oxides of nitrogen | Particulate matter and lead | |
---|---|---|
Continuous measurement | ||
Accuracy | 15% | 25% |
Minimum data capture | 90% | 90% |
Indicative measurement | ||
Accuracy | 25% | 50% |
Minimum data capture | 90% | 90% |
Minimum time coverage | 14% (One measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year.) | 14% (One measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year.) |
Modelling | ||
Accuracy | ||
Hourly averages | 50%–60% | |
Daily averages | 50% | |
Annual averages | 30% | 50% |
Objective estimation | ||
Accuracy: | 75% | 100% |