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Air pollution by ozone in the Europe in 1997 and summer 1998 - Part I

Annex 1. Observed exceedances and annual statistics

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Air pollution by ozone in the Europe in 1997 and summer 1998 - Part I

ANNEX 1. Observed exceedances and annual statistics

Observed exceedances of ozone threshold values and annual statistics in 1997 at individual monitoring stations reporting in the framework of the Council Directive 92/72/EEC on air pollution by ozone.

Information on exceedances and concentrations of ozone and its precursors for the individual stations in EU Member States and several other European countries reporting in the framework of the Ozone Directive over the period 1 January 1997 - 31 December 1997 is available in computer readable form only. In the framework of the Council decision on Exchange of Information (Council Decision 97/101/EC) the Member States will report hourly ozone concentration for (a selection of) the reporting stations. These hourly data will become available from the EEA-ETC/AQ database AIRBASE.

Exceedances of the threshold value of 360 µg/m³ for hourly values has been observed in 1997 at one station only:

country	station name & city	date, time	max conc (µg/m³)
Greece	Lykovrissi, Athens	18 June, 13.00	383

From the AIRBASE pages at the web site of the Topic Centre the following tables are available:

Table I.1: Number of days, the number of periods of consecutive days on which exceedances of the threshold values of 180 µg/m³ and 200 µg/m³ for hourly values have been observed and exceedance rate at reporting monitoring stations; period 1 January - 31 December 1997.

Table I.2: Number of days, the number of periods of consecutive days on which exceedances of the threshold values of 110 µg/m³ for 8-hourly values and 65 µg/m³ for daily values have been observed and exceedance rates at reporting monitoring stations; period 1 January - 31 December 1997.

Table I.3. Annual statistics (50, 98 and 99.9 percentile values and maximum values) of hourly and moving 8-hourly ozone concentrations for reporting monitoring stations; all concentrations in µg/m³; period 1 January - 31 December 1997.

Table I.4. Annual statistics (averaged, 50-, 95- and 98- percentile values) of hourly NO_x and NO₂ concentrations for reporting monitoring stations; all concentrations as NO₂ equivalents in µg/m³; period 1 January - 31 December 1997.

Table I.5. 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 1997.

Notes to the Tables

Table I.1

In Table I.1 it is also indicated when no exceedance of (one or more) threshold values has been 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; "-1" indicates missing data.

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	ER-180 (1)	exceedance rate for the 180 µg/m³ threshold values for 1h average ozone concentrations;
6	ER-200 (1)	exceedance rate for the 200 µg/m³ threshold values for 1h average ozone concentrations has been exceeded;
7	D-180 (1)	number of days on which the 180 µg/m³ threshold values for 1h average ozone concentrations has been exceeded;
8	D-200 (1)	number of days on which the 200 µg/m³ threshold values for 1h average ozone concentrations has been exceeded;
9	P-180 (1)	number of periods of consecutive days on which the 180 µg/m³ threshold values for 1h average ozone concentrations has been exceeded;
10	P-200 (1)	number of periods of consecutive days on which the 200 µg/m³ threshold values for 1h average ozone concentrations has been exceeded;
11	% 1h val	percentage of valid 1h averaged ozone 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	ER-110 (8a)	exceedance rate for the 110 µg/m³ threshold values for the non-overlapping 8-hourly ozone values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00;
6	ER-110 (8b)	exceedance rate for the 110 µg/m³ threshold values for the 8-hourly ozone values between 12.00-20.00;
7	D-110 (8a)	number of days on which the 110 µg/m³ threshold values for the non-overlapping 8-hourly ozone values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00 has been exceeded;
8	D-110 (8b)	number of days on which the 110 µg/m³ threshold values for the 8-hourly ozone values between 12.00-20.00 has been exceeded;
9	P-110 (8a)	number of periods of consecutive days on which the 110 µg/m³ threshold values for the non-overlapping 8-hourly ozone values between 0.00-8.00, 8.00-16.00 and 16.00 and 24.00 has been exceeded;
10	P-110 (8b)	number of periods of consecutive days on which the 110 µg/m³ threshold values for the 8-hourly ozone values between 12.00-20.00 has been exceeded;
11	ER-65(24)	exceedance rate for the 65 µg/m³ threshold values for the 24-hourly ozone values;
12	D-65 (24)	number of days on which the 65 µg/m³ threshold values for the 24-hourly ozone values has been exceeded;
13	P-65 (24)	number of periods of consecutive days on which the 65 µg/m³ threshold values for the 24-hourly ozone values has been exceeded;
14	% 8h 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	1h P50	50 percentile of hourly ozone values (µg/m³);
6	1h P98	98 percentile of hourly ozone values (µg/m³);
7	1h P99.9	99.9 percentile of hourly ozone values (µg/m³) (additional information);
8	1h MAX	maximum value of hourly ozone value (µg/m³);
9	% 1h val	percentage of valid 1h average ozone values;
10	8h P50	50 percentile of 8-hourly ozone values (µg/m³, calculated as a moving average);
11	8h P98	98 percentile of 8-hourly ozone values (µg/m³);
12	8h P99.9	99.9 percentile of 8-hourly ozone values (µg/m³, additional information);
13	8h MAX	maximum value of 8-hourly ozone value (µg/m³);
14	% 8h val	percentage of valid 8h average ozone values (µg/m³).

Table I.4

Explanations of headings of Table I.4 (Note that NO_x concentrations are given as µg NO₂ equivalents per m³; 1 µg NO₂ /m³ = 0.52 ppb ) :

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_x	yearly averaged NO_x concentration (µg/m³);
6	PARP50_x	50-percentile of hourly NO_x concentration (µg/m³);
7	PARP90_x	90-percentile of hourly NO_x concentration (µg/m³);
8	PARP95_x	95-percentile of hourly NO_x concentration (µg/m³);
9	%val_x	Percentage of valid 1h average NO_x values
10	AVER_2	yearly averaged NO₂ concentration (µg/m³);
11	PARP50_2	50-percentile of hourly NO₂ concentration (µg/m³);
12	PARP90_2	90-percentile of hourly NO₂ concentration (µg/m³);
13	PARP95_2	95-percentile of hourly NO₂ concentration (µg/m³);
14	% val_2	percentage of valid 1h average NO₂ values.

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 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 VOC values.