Accumulated Ozone Exposure 40 (expressed in (ug/m3) XXX hours) means the sum of the difference between hourly concentrations greater than 80 ug/m3 and 80 ug/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.
Described in section 5.2.4 of the Aggregation Document
AOT40 vegetation protection averaged over 5 years
AOT40 vegetation protection (AOT40) averaged over 5 years. Following 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.
Number of valid hourly value for AOTc calculations
Number of valid hourly values (flag 1, 2, 3) between StartTime => 07:00 UTC and EndTime =< 19:00 AND YYYY-05-01T01:00:00+00:00 and YYYY-07-31T24:00:00+00:00
Number of valid hourly value for AOTf calculations
Number of valid hourly values (flag 1, 2, 3) between StartTime => 07:00 UTC and EndTime =< 19:00 AND YYYY-04-01T01:00:00+00:00 and YYYY-09-31T24:00:00+00:00)
Preliminary hourly calculation for AOT40 for AOT40c & AOT40f
max (0, hourly concentration - 80) for hours with StartTime => 07:00 UTC and EndTime =< 19:00 and period YYYY-04-01T01:00:00+00:00 and YYYY-09-31T24:00:00
The daily average or daily mean is the average of all valid hourly values for a day. A daily or 24-hourly average is calculated if at least 18 valid hourly values are available.
Base aggregation - described in section 3.1 of Aggregation document
Data capture for one day. This is an aggregation type added by EEA
Internal calculation - described in section 4.1.1 of Aggregation document
Number of hours with values higher than 180 (unit) in given day
Number of hours with values higher than 240 (unit) in given day
Data fractions missing due to calibration or station repaire. This is an aggregation type added by EEA
Internal calculation - described in section 4 of Aggregation document
Average between 1 hour/day of month X to last hour/day of month X (example for 31 days month: 1/X/YearY - 31/X/YearY)
Number of days with daymax (P8H-dmax) values higher than 100 (unit) in given month
Number of days with daymax (P8H-dmax) values higher than 120 (unit) in given month
Number of hours with values higher than 180 (unit) in given month
Described in section 5.3.2 of the Aggregation Document
Number of hours with values higher than 200 (unit) in given month
Number of hours with values higher than 240 (unit) in given month
Number of hours with values higher than 350 (unit) in given month
Number of hours with values higher than 400 (unit) in given month
Average between 1st January to 31st December Year X (1/1/YearX - 31/12/YearX)
Described in section 5.1 of Aggregation document (Averages and means)
Number of periods when 3 consecutive days are higher than 50 in a given year
Number of periods when 3 consecutive days are higher than 90 in a given year
3 consecutive hours in exceedance of 200
Number of periods when 3 consecutive hours are higher than 200 in a given year
3 consecutive hours in exceedance of 350
Number of periods when 3 consecutive hours are higher than 350 in a given year
3 consecutive hours in exceedance of 400
Number of periods when 3 consecutive hours are higher than 400 in a given year
Described in section 5.3.3 of the Aggregation Document
3 consecutive hours in exceedance of 500
Number of periods when 3 consecutive hours are higher than 500 in a given year
Number of days with daymax values (P8H_dmax) higher than 10 (unit) in given year
The 90.4th percentile of daily averages (P1D) in a given year Aggregation for Compliance.
Described in section 5.2.1 of the Aggregation Document
The 90.41th percentile of daily averages (P1D) in a given year
1 year 95.07 percentile of daily means (P1D) or .../aq/primaryObservation/day
The 95.07th percentile of daily averages in a given year associated to New Directive for pollutants (corresponding with the 19th highest daily value)
1 year 99 percentile of daily means (P1D) or .../aq/primaryObservation/day
The 99th percentile of daily averages in a given year associated to WHO guidelines for pollutants PM10 (5), PM2.5 (6001), NO2 (8), SO2 (1) and CO (10)
New aggregates for new AQ 2021 WHO guidelines
1 year 99.18 percentile of daily value/mean (see P1Y-day-max-per99.18)
The 99.18th percentile of daily averages (P1Y-P1D) in a given year (corresponding with the 4th highest daily value) - Aggregation uses P1Y-day-max-per99.18
The mean for a multi-__day sampler based data types shall be evaluated in a similar way to the data capture (see section 4.2)- although in this instance is calculated as the time weighted mean of valid measurements over the sample period. mean = _i DCi * Nvalid-i Cvalid-i / _i DCi * Nvalid-i i=1.... n where DCi = the data capture of sample i Nvalid-i = the number of hours of the valid sampling period i Cvalid-i = concentration for valid sampling period i
The data capture for multi day sampler based data types integrated over an averaging period is calculated as the proportion of valid measurement time (at a minimum seconds- alternatively decimal hours or days) relative total measured time in the averaging period- expressed as an percentage. The data capture for a given averagingperiod shall be calculated as follows: Data capture = _i DCi * Nvalid-i / _i Ni * 100 % where DCi = the data capture (in %) of the valid sample I- that is- the effective sampling time in a measuring period Nvalid-i = the number of hours in the valid sample i (validity flag sample > 0) Ni = number of hours in sample i
The time coverage is the percentage of measurement time in a given averaging period. Also the time coverage is calculated on base of the number of hours in the sample periods. The time coverage for a given averaging period is calculated as follows (weighted average): Time coverage = _i TCi * Ni / Naveraging_period * 100 % where TCi = the time coverage of sample i Ni = number of hours in sample i Naveraging_period = the total number of hours in the given averaging period (e.g. a year)
Extra aggregation - described in section 5.2.2 of the Aggregation Document
1 year 99.18 percentile of daily MEAN (P1Y-P1D-per99.18)
The 99.18th percentile of daily MEAN (P1Y-P1D) in a given year (corresponding with the 4th highest daily value) - DESCRIPTION UPDATE - notation SHOULD REALLY BE P1Y-P1D-per99.18
The 36th highest daily average value in a given year
The 4th highest daily value in a given year
1 year 50 %ile of daily values in a year
The 50th percentile of DAILY values in a given year
Number of days with values higher than 100 (unit) in given year
Number of days with daily average values higher than 125 (unit) in given year
Number of days with daily average values higher than 25 (unit) in given year
Number of days with daily average values higher than 4 (unit) in given year
Number of days with daily average values higher than 45 (unit) in given year
Number of days with daily average values higher than 50 (unit) in given year
Number of days with daily average values higher than 90 (unit) in given year
Data capture of reported units in 1 year
Data capture of primary reported units (like hour/day XXX) for the given year
Described in section 4.1.1 of Aggregation document
1 year 93.15 percentile daily 8h maximum
The 93.15th percentile of daily 8h maximum (P8H-dmax) in a given year
1 year 95.07 percentile daily 8h maximum
The 95.07th percentile of daily 8h maximum (P8H-dmax) in a given year
The 99th percentile of daily 8h maximum (P8H-dmax) in a given year
Number of days with daymax (P8H-dmax) values higher than 100 (unit) in given year
Number of days with daymax (P8H-dmax) values higher than 120 (unit) in given year
Average day max value between 1st January to 31st December Year X (1/1/YearX - 31/12/YearX)
Described in section 3.1 of Aggregation document
Data capture of daily maximum values in 1 year
The highest P8H-dmax value in given year
It is the highest P8H-dmax (https://dd.eionet.europa.eu/vocabularyconcept/aq/aggregationprocess/P8H-dmax/view) value in a year, and because of that, only calculated for O3 and CO.
The 26th highest daymax value in a given year
Number of valid daymax values in given year
1 year 99.73 %ile of hourly values in a given year
The 99.73th percentile of hourly values (/hour) in a given year (equivalent to 25th highest hourly value)
1 year 99.79 %ile of hourly values in a given year
The 99.79 percentile of hourly values in a given year (corresponding to 19th highest hourly value)
1 year 99.97 %ile of hourly values in a given year
The 99.97th percentile of hourly values (/hour) in a given year (equivalent to 4th highest hourly value)
The 19th highest hourly value in a given year
The 25th highest hourly value in a given year
The 50th percentile of HOURLY values in a given year
Number of hours with values higher than 150 (unit) in given year
Number of hours with values higher than 180 (unit) in given year
Number of hours with values higher than 200 (unit) in given year
Number of hours with values higher than 240 (unit) in given year
Number of hours with values higher than 275 (unit) in given year
Number of hours with values higher than 350 (unit) in given year
Number of hours with values higher than 400 (unit) in given year
Yearly highest six monthly average of daily maximum 8-hour mean concentration
Average of daily maxiumum 8-hour mean concentration in the six consecutive months (P6M-P8H-dmax) with the highest P6M-P8H-dmax in the year
Author's note: this differs to P1Y-peakP6M-P8H-dmax where the yearly 6 month average is selected according to the highest six-month running-average concentration (highest P6M in the year).
Total number of primary reported units (like hours/days XXX) in current year
Total number of valid primary reported units (like hours/days...) in current year
Average of daily maxiumum 8-hour mean concentration in the six consecutive months (P6M-P8H-dmax) with the highest six-month running-average concentration (highest P6M in the year).
ETC has done some work on the proposed methodology for P1Y-peakP6M-P8H-dmax and agreed with EEA, we have decided to simplify the process and calculate, for now, P1Y-maxP6M-P8H-dmax P1Y-maxP6M-P8H-dmax is the maximum P6M-P8H-dmax of the year (using date-end. NOTE: remember that you are storing end date as 01/XX/YYYY instead of end of the period). DC should be calculated base on the number of P6M-P8h-dmax valid in the year and following similar approach for DataCapture, MissingData and TimeCoverage. Example: if for 2020 we have 12 P6M-P8h-dmax with end time within 2020 of which 11 are valid (above 75% DC) then, the DC for P1Y-maxP6M-P8h-dmax will be 11/12 -> 91.67%
Three-year running mean concentration. Average between 1st January Year X-2 to 31st December Year X (1/1/Year X-2 - 31/12/Year X)
Daymax exceed 120 averaged over 3 consecutive years
Number of days with daymax values higher than 120 (unit) averaged over 3 years
Average between 1 hour/day of month X-5 to last hour/day of month X (example for first 6 month's in the year: 1/1/2021 to 31/6/2021) (example for months between years: 1/8/2021 to 31/1/2022)
Average of the daily maximum eight-hour mean (P8H-dmax) in 6 consecutive months
Average of the daily maximum eight-hour mean (P8H-dmax) in 6 consecutive months.
The daily maximum 8-hour running mean for a day is the maximum of the valid hourly 8-hour running means for that day. A daily maximum 8-hour mean is calculated if at least 18 valid hourly 8-hour running means are available for that particular day.
Base aggregation - described in section 3.2 of Aggregation document
The 8-hour running mean value for each hour is calculated as the average of the valid values for that hour and the 7 foregoing hours (averaging period). So- the averaging period of hour1 of dayn is hour17 of dayn-1 until hour1 of dayn. The averaging period of hour24 of dayn is hour16 of dayn until hour24 of dayn. A 8-hourly running averaged concentration is calculated if at least 6 valid hourly values are available.
For quantification of the health impacts the World Health Organisation recommends the use of the SOMO35 indicator. SOMO10 stands for means the sum of the differences between maximum daily 8-hour running mean concentrations greater than 20 µg/m3 (= 10 parts per billion) and 20 µg/m3
For quantification of the health impacts the World Health Organisation recommends the use of the SOMO35 indicator. SOMO35 stands for means the sum of the differences between maximum daily 8-hour running mean concentrations greater than 70 µg/m3 (= 35 parts per billion) and 70 µg/m3
Average between 1st May to 31th July Year X.
Average between 1st April to 30th September Year X.
Average between 1st October Year X-1 to 31st March Year X.
Accumulated Ozone Exposure 40 (expressed in (ug/m3) XXX hours) means the sum of the difference between hourly concentrations greater than 80 ug/m3 and 80 ug/m3 between 1 April to 30 September using only the one-hour values measured between 8.00 and 20.00 Central European Time (CET) each day.