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gbonafe Jan 18, 2018 08:59 AM
Hi. In your interactive map providing near-real-time information about air pollution ( the Italian monitoring stations are always grey ("No data"). As far as I know, the Italian Institute ISPRA will start sending the data in few weeks. Nevertheless, I wonder if this will be enough to calculate the Air Quality Index for most of the Italian monitoring stations. As explained in your webpage, "the index is calculated for those stations which measure at least the three pollutants NO2, O3 and PM" and "PM10 and PM2.5 values are based on 24-hour running means". Therefore, if I understood correctly, no AQI is calculated for the stations which do not measure PM on hourly basis. Unfortunately, in most of the Italian regions, almost all measures of PM are daily concentrations, not hourly. So will Italy continue to be gray?
Replies (3)
EEA Jan 19, 2018 08:53 AM

It appears indeed that the IT authorities' daily PM data disseminate (at least those transferred to us) for the majority of their stations. However, from the meta-information we have received from them, many if not the majority of the stations use equipment, equivalent to the reference method, which makes hourly measurement.
We’ll contact the Italian authorities to make sure to receive the hourly data when they will start UTD reporting.
Note also that an AQ index is calculated even when a pollutant is missing but appears in a faded colour.

Kind regards
gbonafe Jan 20, 2018 12:00 AM
Thank you for the answer.
I'm not a measurement expert, but I think the reference method for PM10 is the gravimetric EN12341, which makes daily measurements, not hourly. So equivalence with the reference is not a guarantee of hourly frequency. Most of the equipments (e.g.SWAM5aDual) used in Italy could provide also hourly data, if they were set up to do it, but in many stations they aren't.
I quote the question of Jaume Targa "What would be the implications on UTD [Up-To-Date] if MS [Member State] decides that they will only provide aggregated 24h daily values?"

Best regards
EEA Jan 23, 2018 01:41 PM

As confirmed by the meta-information reported by the Italian authorities, most of the equipment can provide hourly data. If the Italian authorities decide however not to report hourly data for PM, the AQ index will not be a full index but a partial index calculated on the basis of the other pollutants.
Similarly, PM will not appear in the UTD viewer. We have no authority to oblige them to report hourly data. However, it belongs to the EU Commission to evaluate whether this is in line with the provisions of the Air Quality Directive.

Kind regards