Annex I: Observed exceedances and annual statistics

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AIR POLLUTION BY OZONE IN THE EUROPEAN UNIO Exceedance of Ozone Threshold Values in 1996 and Summer 1997

ANNEX I. Observed Exceedances and Annual Statistics

Observed exceedances of ozone threshold values and annual statistics in 1996 at individual monitoring stations reporting in the framework of the Council Directive 92/72/EEC on air pollution by ozone.

Information on ozone exceedances and concentrations for the individual stations reporting in the framework of the Ozone Directive over the period 1 January 1996 - 31 December 1996 is available in computer readable form only. Upon request a diskette containing the following tables is available:

Table I.1: Number of days on which exceedances of threshold values (180 µg/m³ and 200 µg/m³ for hourly values; 110 µg/m³ for 8-hourly values and 65 µg/m³ for daily values) were observed at reporting monitoring stations; period 1 January - 31 December 1996.

Table I.2: The longest period of consecutive days on which exceedances of threshold values were observed at reporting monitoring stations; period 1 January - 31 December 1996.

Table I.3: Average length (in days) of periods of consecutive days on which exceedances of threshold values were observed at reporting monitoring stations; period 1 January - 31 December 1996.

Table I.4: Annual statistics (percentiles and maximum values) of hourly and moving eight hourly ozone concentrations for reporting monitoring stations; all concentrations in µg/m³; period 1 January - 31 December 1996.

Table I.5: Annual statistics (averaged, 50-, 95- and 98- percentile values) of hourly NO_x concentrations for reporting monitoring stations; all concentrations in µg/m³; period 1 January - 31 December 1996.

Table I.6: Annual statistics (averaged, 50-, 95- and 98- percentile values) of hourly NO₂ concentrations for reporting monitoring stations; all concentrations in µg/m³; period 1 January - 31 December 1996.

Table I.7: Annual statistics (averaged, 50-, 95- and 98- percentile values) of daily VOC concentrations for reporting monitoring stations; all concentrations in µg/m³; period 1 January - 31 December 1996.

Notes to the Tables

Table I.1

Exceedances of the threshold value of 360 µg/m³ for hourly values has been observed in 1996 at 2 stations:

country	station name & city	date, time	max conc (µg/m³)
Greece	Liosia, Athens Marousi	21 May 1996, 14.00 21 May 1996, 13.00	391 361

In Table I.1 it is also indicated when no exceedance of (one or more) threshold values was observed at the station. This information has not been submitted by the Member States and is inferred from the available data. In cases where the information was insufficient for an unambiguous answer a "?" is printed.

Explanations of headings of Table I.1:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	180 (1)	number of days on which the 180 µg/m³ threshold values for 1h average concentrations has been exceeded;
6	200 (1)	number of days on which the 200 µg/m³ threshold values for 1h average concentrations has been exceeded;
7	110 (8a)	number of days on which the 110 µg/m³ threshold values for the non-overlapping 8 hourly values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00 has been exceeded;
8	110 (8b)	number of days on which the 110 µg/m³ threshold values for the 8 hourly values between 12.00-20.00 has been exceeded;
9	65 (24)	number of days on which the 65 µg/m³ threshold values for the 24 hourly values has been exceeded;
10	% 1h val	percentage of valid 1h averaged values.

Table I.2:

Explanations of headings of Table I.2:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	180 (1)	longest period (in days) during which the 180 µg/m³ threshold values for 1h average concentrations has been exceeded;
6	200 (1)	longest period (in days) during which the 200 µg/m³ threshold values for 1h average concentrations has been exceeded;
7	110 (8a)	longest period (in days) during which the 110 µg/m³ threshold values for the non-overlapping 8 hourly values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00 has been exceeded;
8	110 (8b)	longest period (in days) during which the 110 µg/m³ threshold values for the 8 hourly values between 12.00-20.00 has been exceeded;
9	65 (24)	longest period (in days) during which the 65 µg/m³ threshold values for the 24 hourly values has been exceeded;
10	% 1h val	percentage of valid 1h average values.

Table I.3

Explanations of headings of Table I.3:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	180 (1)	average length of period (in days) during which the 180 µg/m³ threshold values for 1h average concentrations has been exceeded;
6	200 (1)	average length of period (in days) during which the 200 µg/m³ threshold values for 1h average concentrations has been exceeded;
7	110 (8a)	average length of period during (in days) which the 110 µg/m³ threshold values for the non-overlapping 8 hourly values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00 has been exceeded;
8	110 (8b)	average length of period (in days) during which the 110 µg/m³ threshold values for the 8 hourly values between 12.00-20.00 has been exceeded;
9	65 (24)	average length of period (in days) during which the 65 µg/m³ threshold values for the 24 hourly values has been exceeded;
10	% 1h val	percentage of valid 1h average values.

Table I.4

Explanations of headings of Table I.4:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	1h P50	50 percentile of hourly values (µg/m³);
6	1h P98	98 percentile of hourly values (µg/m³);
7	1h P99.9	99.9 percentile of hourly values (µg/m³) (additional information);
8	1h MAX	maximum value of hourly value (µg/m³);
9	% 1h val	percentage of valid 1h average values;
10	8h P50	50 percentile of eight hourly values (µg/m³, calculated as a moving average);
11	8h P98	98 percentile of eight hourly values (µg/m³);
12	8h P99.9	99.9 percentile of eight hourly values (µg/m³) (additional information);
13	8h MAX	maximum value of eight hourly value (µg/m³);
14	% 8h val	percentage of valid 8h average values (µg/m³).

Table I.5

Explanations of headings of Table I.5:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	AVER	yearly averaged NO_x concentration (µg/m³);
6	PARP50	50-percentile of hourly NO_x concentration (µg/m³);
7	PARP90	90-percentile of hourly NO_x concentration (µg/m³);
8	PARP95	95-percentile of hourly NO_x concentration (µg/m³);
9	% val	percentage of valid 1h average values.

Table I.6

Explanations of headings of Table I.6:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	AVER	yearly averaged NO₂ concentration (µg/m³);
6	PARP50	50-percentile of hourly NO₂ concentration (µg/m³);
7	PARP90	90-percentile of hourly NO₂ concentration (µg/m³);
8	PARP95	95-percentile of hourly NO₂ concentration (µg/m³);
9	% val	percentage of valid 1h average values.

Table I.7

Explanations of headings of Table I.7:

column	name	explanation
1	codcou	country code;
2	staname	name of monitoring station;
3	incod	code number of monitoring station;
4	ville	city where station is located;
5	AVER	yearly averaged VOC concentration (µg/m³);
6	PARP50	50-percentile of hourly VOC concentration (µg/m³);
7	PARP90	90-percentile of hourly VOC concentration (µg/m³);
8	PARP95	95-percentile of hourly VOC concentration (µg/m³);
9	% val	percentage of valid 24h average values.