Frequently Asked Questions

  • How do you decide whether the data captured from a monitoring site are sufficient or not?

    For calculation of the indicator statistics, a data capture lower limit of 75% is applied. This is intended ensure that a data set is used that is representative of the whole year (to include summer and winter) but that not too many sites are excluded. For measurements made in the UK automatic networks a data capture target of 90% is applied.

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