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It is not yet possible to determine a trend in Figure 1. Losses from the application of pesticides may vary considerably between years, depending upon, for example, crop type and the weather, while the frequency of monitoring of pesticides in surface waters can be limited to one year out of three. Changes to the approval status of pesticides influence their use and presence in water, which can also lead to difficulties in interpreting trends over time. For these reasons, changes between years may not be significant. It is anticipated that a trend will become apparent in the next few years.
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"It is not yet possible to determine a trend in Figure 1...because...the frequency of monitoring of pesticides in surface waters can be limited to one year out of three"
1 ) How many countries present a frequency of monitoring only 1 year out of 3 ?
2 ) Why do not determine trend on a regular 3 years spaced regular time serie ?
AT
No, in case the data collection does not change in order to have more comparable database, a trend as regards the risk from chemical pesticides will not be evaluable. Not yet and not in future.
I would find it very helpful to read few sentences about the recent results of the WFD reporting on pesticides (e.g. number of water bodies in poor status due to pesticides….) maybe comparing 2 RBMP cycles?