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The Air Quality Limit Values (Scotland) Regulations 2003

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Regulations 2, 4(1), 10(2), (3), 11(1),(3), 14(12), (13)

SCHEDULE 1LIMIT VALUES, MARGINS OF TOLERANCE, INFORMATION AND ALERT THRESHOLDS

PART ISULPHUR DIOXIDE

Limit values for sulphur dioxide

Averaging periodLimit valueMargin of tolerance (a)Date by which limit value is to be met

1.  Hourly limit value for the protection of human health

1 hour350 μg/m3, not to be exceeded more than 24 times a calendar year60 μg/m3, reducing to 30μg/m3 on 1st January 2004 and to 0 μg/m3 on 1st January 20051st January 2005

2.  Daily limit value for the protection of human health

24 hours125 μg/m3, not to be exceeded more than 3 times a calendar yearNone1st January 2005

Alert threshold for sulphur dioxide

1.2  500 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone, whichever is the smaller.

Minimum details to be made available to the public when the alert threshold for sulphur dioxide is exceeded

1.3  Details to be made available to the public should include at least–

(a)the date, hour and place of the occurrence and the reasons for the occurrence, where known;

(b)any forecasts of–

(i)changes in concentration (improvement, stabilisation, or deterioration), together with the reasons for those changes;

(ii)the geographical area concerned; and

(iii)the duration of the occurrence;

(c)the type of population potentially sensitive to the occurrence; and

(d)the precautions to be taken by the sensitive population concerned.

PART IINITROGEN DIOXIDE (NO2) AND OXIDES OF NITROGEN (NOx)

Limit values for nitrogen dioxide and oxides of nitrogen

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met

1.  Hourly limit value for the protection of human health

1 hour200 μg/m3 NO2, not to be exceeded more than 18 times a calendar year70 μg/m3, reducing on 1st January 2004 and on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 20101st January 2010

2.  Annual limit value for the protection of human health

Calendar year40 μg/m3 NO214 μg/m3, reducing on 1st January 2004 and on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 20101st January 2010

Alert threshold for nitrogen dioxide

2.2  400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller.

Minimum details to be made available to the public when the alert threshold for nitrogen dioxide is exceeded

2.3  Details to be made available to the public should include at least–

(a)the date, hour and place of the occurrence and the reasons for the occurrence, where known;

(b)any forecasts of–

(i)changes in concentration (improvement, stabilisation, or deterioration), together with the reasons for those changes;

(ii)the geographical area concerned; and

(iii)the duration of the occurrence;

(c)the type of population potentially sensitive to the occurrence; and

(d)the precautions to be taken by the sensitive population concerned.

PART IIIPARTICULATE MATTER (PM10)

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met

1.  24-hour limit value for the protection of human health

24 hours50 μg/m3 PM10, not to be exceeded more than 35 times a calendar year10 μg/m3 , reducing on 1st January 2004 to 5 μg/m3 and on 1st January 2005 to 0 μg/m3.1st January 2005

2.  Annual limit value for the protection of human health

Calendar year40 μ g/m3 PM103.2 μg/m3, reducing on 1st January 2004 to 1.6μg/m3 and on 1st January 2005 to 0 μg/m31st January 2005

PART IVLEAD

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met
Annual limit value for the protection of human healthCalendar year0.5 μg/m30.2 μg/m3, reducing on 1st January 2004 to 0.1μg/m3 and on 1st January 2005 to 0 μg/m31st January 2005

PART VBENZENE

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met
Limit value for the protection of human healthCalendar year5μg/m35μg/m3 reducing on 1st January 2006 and every 12 months thereafter by 1 μg/m3 to reach 0 μg/m3 by 1st January 20101st January 2010

PART VICARBON MONOXIDE

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met
Limit value for the protection of human healthMaximum daily 8-hour mean10mg/m34 mg/m3 reducing on 1st January 2004 to 2 mg/m3, and to 0 mg/m3 on 1st January 20051st January 2005

6.2  The maximum daily 8-hour mean concentration shall be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated shall be assigned to the day on which it ends, i.e. the first calculation period for any one day shall be the period from 17:00 on the previous day to 0100 on that day; the last calculation period for any one day shall be the period from 1600 to 2400 on that day.

PART VIIOZONE

Information and alert thresholds for ozone

ParameterThreshold
(a)

The exceedance of the threshold is to be measured or predicted for three consecutive hours.

Information threshold1 hour average180μg/m3
Alert threshold1 hour average(a)240μg/m3

Minimum details to be supplied to the public when the information or alert threshold is exceeded or exceedance is predicted

7.2.  Details to be supplied to the public on a sufficiently large scale as soon as possible should include the following.

1.  Information on any observed exceedance–

(a)the location or area of the exceedance;

(b)the type of threshold exceeded (information threshold or alert threshold);

(c)the time at which the exceedance began and its duration; and

(d)the highest 1-hour and 8-hour mean concentration.

2.  Forecast for the following afternoon, day or days–

(a)the geographical area of expected exceedances of an information threshold or alert threshold;

(b)the expected change in pollution, that is, improvement, stabilisation or deterioration.

3.  Information on the type of population concerned, possible health effects and recommended conduct–

(a)information on population groups at risk;

(b)description of likely symptoms;

(c)recommended precautions to be taken by the population concerned; and

(d)where to find further information.

4.  Information provided under this Schedule shall also include–

(a)information on preventive action to reduce pollution or exposure to it;

(b)an indication of main source sectors; and

(c)recommendations for action to reduce emissions.

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