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The Air Quality Limit Values Regulations (Northern Ireland) 2002

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PART IUPPER AND LOWER ASSESSMENT THRESHOLDS

The following upper and lower assessment thresholds will apply:

(a)SULPHUR DIOXIDE

Health protectionEcosystem protection
Upper assessment threshold60% of 24-hour limit value (75 μg/m3) not to be exceeded more than 3 times in any calendar year60% of winter limit value (12 μg/m3)
Lower assessment threshold40% of 24-hour limit value (50 μg/m3) not to be exceeded more than 3 times in any calendar year40% of winter limit value (8 μg/m3)

(b)NITROGEN DIOXIDE AND OXIDES OF NITROGEN

Hourly limit value for the protection of human health (NO2)Annual limit value for the protection of human health (NO2)Annual limit value for the protection of vegetation (NOx)
Upper assessment threshold70% of limit value (140 μg/m3) not to be exceeded more than 18 times in any calendar year80% of limit value (32 μg/m3)80% of limit value (24 μg/m3)
Lower assessment threshold50% of limit value (100 μg/m3) not to be exceeded more than 18 times in any calendar year65% of limit value (26 μg/m3)65% of limit value (19.5 μg/m3)

(c)PARTICULATE MATTER(1)

24-hour averageAnnual average
Upper assessment threshold60% of limit value (30 μg/m3) not to be exceeded more than 7 times in any calendar year70% of limit value (14 μg/m3)
Lower assessment threshold40% of limit value (20 μg/m3) not to be exceeded more than 7 times in any calendar year50% of limit value (10 μg/m3)
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 hours50mg/m3 PM10 not to be exceeded more than 7 times a calendar yearTo be derived from data and to be equivalent to Stage 1 limit value.1st January 2010

2.  Annual limit value for the protection of human health

Calendar year20 mg/m3 PM1050% on 1st January 2005 reducing every 12 months thereafter by equal annual percentages to reach 0% by 1st January 20101st January 2010

(d)LEAD

Annual average
Upper assessment threshold70% of limit value (0.35 μg/m3)
Lower assessment threshold50% of limit value (0.25 μg/m3)
(1)

The upper and lower assessment thresholds for PM10 are based on the following indicative limit values for 1 January 2010, which will be reviewed in the light of further information on health and environmental effects, technical feasibility and experience in the application of the existing “Stage 1” limit values

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