3.1 The following data quality objectives, for allowed uncertainty of assessment methods, and of minimum time coverage and of data capture of measurement, are provided to guide quality-assurance programmes.
| For ozone, NO and NO2 | |
|---|---|
| Continuous fixed measurement | |
| Uncertainty of individual measurements | 15% |
| Minimum data capture | 90% during summer |
| 75% during winter | |
| Indicative measurement | |
| Uncertainty of individual measurements | 30% |
| Minimum data capture | 90% |
| Minimum data coverage | >10% during winter |
| Modelling | |
| Uncertainty | 50% |
| 1 hour averages (daytime) | 50% |
| 8 hours daily maximum | |
| Objective estimation | |
| Uncertainty | 75% |