AQD - Purpose of Sampling Point Submitted None Data Dictionary Vocabularies Eionet Data Dictionary Used for National Assessment Exposure Indicator Used to characterise a SamplingPoint to the Assessment Exposure for PM2.5 Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Purpose of Sampling Point Natural Sources (used for) SamplingPoint used for the demonstration or substraction of exceedances attributable to natural sources Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Purpose of Sampling Point Winter-sanding or -salting (used for) Sampling used for the demonstration or substraction of exceedances attributable to winter-sanding or -salting Valid Data Dictionary Vocabularies Eionet Data Dictionary AQD - Purpose of Sampling Point