Three consecutive hours in exceedance Three consecutive hours in exceedance (at locations representative of air quality over at least 100 km 2 or an entire zone or agglomeration, which ever is smaller) ONLY NO2 & SO2 - ALT The percentile 90.4 for PM10 The percentile 90,4 for PM 10 in the particular case when random measurements are applied instead of continuous measurements Average Exposure Indicator The Average Exposure Indicator expressed in μg/m3 (AEI) shall be based upon measurements in urban background locations in zones and agglomerations throughout the territory of a Member State. It should be assessed as a three-calendar year running annual mean concentration averaged over all sampling points established pursuant to Section B of Annex V of Directive 2008/50/EC. AOT40 vegetation protection Accumulated Ozone Exposure 40 (expressed in (μg/m3) ∙ hours) means the sum of the difference between hourly concentrations greater than 80 μg/m3 and 80 μg/m3 between 1 May to 31 July using only the one-hour values measured between 8.00 and 20.00 Central European Time (CET) each day. AOT40 vegetation protection averaged over 5 years AOT40 vegetation protection (AOT40) averaged over 5 years. As per Directive 2008/50/EC, If the three or five year averages cannot be determined on the basis of a full and consecutive set of annual data, the minimum annual data required for checking compliance with the target values will be as follows for the target value for the protection of vegetation: valid data for three years. AOT 40 forest protection Accumulated Ozone Exposure 40 (expressed in (μg/m3) ∙ hours) means the sum of the difference between hourly concentrations greater than 80 μg/m3 and 80 μg/m3 between 1 April to 31 September using only the one-hour values measured between 8.00 and 20.00 Central European Time (CET) each day. Not applicable NA is to be used when reporting an EnvironmentalObjective that does not have a reporting metric (e.g. When reporting Ozone precursos as Monitoring Objective) Annual mean / average Average between 1st January to 31st December (1/1/year X - 31/12/year X) Days in exceedance in a calendar year Days in exceedance in a calendar year (i.e. For PM10 and SO2 number of days when daily mean has exceeded the Limit Value in 1 calendar year. For O3 & CO, days when maximum daily 8-h mean exceed the LTO & LV, respectively in 1 calendar year) Days in exceedance averaged over 3 calendar years Days in exceedance averaged over 3 years. Applicable to Ozone Health Target Value as "Days when maximum daily eight- hour mean exceeded the target value averaged over 3 years" Hours in exceedance in a calendar year Number of hours in exceedance in a calendar year Winter Mean Average over winter. Average between 1st October year x-1 to 31st March year X. Three consecutive days in exceedance Three consecutive days in exceedance (at locations representative of air quality over at least 100 km 2 or an entire zone, which ever is smaller) ONLY PM2.5 & PM10 - ALT