European Union flag

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/m 3 )
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 NOx 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/m 3 threshold values for 1h average ozone concentrations;

6

ER-200 (1) exceedance rate for the 200 µg/m 3 threshold values for 1h average ozone concentrations has been exceeded;

7

D-180 (1) number of days on which the 180 µg/m 3 threshold values for 1h average ozone concentrations has been exceeded;

8

D-200 (1) number of days on which the 200 µg/m 3 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/m 3 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/m 3 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/m 3 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/m 3 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/m 3 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/m 3 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/m 3 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/m 3 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/m 3 threshold values for the 24-hourly ozone values;

12

D-65 (24) number of days on which the 65 µg/m 3 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/m 3 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/m 3 );

6

1h P98 98 percentile of hourly ozone values (µg/m 3 );

7

1h P99.9 99.9 percentile of hourly ozone values (µg/m 3 ) (additional information);

8

1h MAX maximum value of hourly ozone value (µg/m 3 );

9

% 1h val percentage of valid 1h average ozone values;

10

8h P50 50 percentile of 8-hourly ozone values (µg/m 3 , calculated as a moving average);

11

8h P98 98 percentile of 8-hourly ozone values (µg/m 3 );

12

8h P99.9 99.9 percentile of 8-hourly ozone values (µg/m 3 , additional information);

13

8h MAX maximum value of 8-hourly ozone value (µg/m 3 );

14

% 8h val percentage of valid 8h average ozone values (µg/m 3 ).

Table I.4

Explanations of headings of Table I.4 (Note that NOx 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/m 3 );

6

PARP50_x 50-percentile of hourly NO x concentration (µg/m 3 );

7

PARP90_x 90-percentile of hourly NO x concentration (µg/m 3 );

8

PARP95_x 95-percentile of hourly NO x concentration (µg/m 3 );

9

%val_x Percentage of valid 1h average NO x values

10

AVER_2 yearly averaged NO 2 concentration (µg/m 3 );

11

PARP50_2 50-percentile of hourly NO 2 concentration (µg/m 3 );

12

PARP90_2 90-percentile of hourly NO 2 concentration (µg/m 3 );

13

PARP95_2 95-percentile of hourly NO 2 concentration (µg/m 3 );

14

% val_2 percentage of valid 1h average NO 2 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/m 3 );

6

PARP50 50-percentile of hourly VOC concentration (µg/m 3 );

7

PARP90 90-percentile of hourly VOC concentration (µg/m 3 );

8

PARP95 95-percentile of hourly VOC concentration (µg/m 3 );

9

% val percentage of valid 24h average VOC values.