The Air Quality (Ozone) Regulations (Northern Ireland) 2003

PART I information on ozone concentrations

The following information on ozone concentrations shall be obtained and collated:

	Type of station	Level	Averaging/ accumulation time	Provisional date for each month from April to September	Report for each year
(a) in this Schedule, “AOT40” has the same meaning as in paragraph (d) of Part I to Schedule 1.
(b) maximum daily 8-hour mean.
Information threshold	Any	180μg/m3	1 hour	for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required. monthly 1 hour maximum ozone.	–for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required.
Alert threshold	Any	240μg/m3	1 hour	– for each day with any exceedance: date, total hours of exceedance, maximum1 hour ozone and related NO2 values.when required	– for each day with any exceedance: date, total hours of exceedance, maximum 1 hour ozone and related NO2 values when required.
Health protection	Any	120μg/m3	8 hours	– for each day with any exceedance: date, 8 hours maximum (b)	– for each day with any exceedance: date, 8 hours maximum (b)
Vegetation protection	Suburban, rural,rural= background	AOT40 (a) 6,000 μg/m3·h	1 hour, accumulated from May to June		Value
Forest protection	Suburban, rural, rural= background	AOT40 (a) 20,000 μg/m3·h	1 hour, accumulated from April to September		Value
Materials	Any	40μg/m3	1 year		Value

Where they do not do so already, annual reports must also contain:

(a)

for ozone, nitrogen dioxide, oxides of nitrogen and the sums of ozone and nitrogen dioxide (added as parts per billion and expressed in mg/m³ ozone) the maximum, 99.9th, 98th and 50th percentiles and annual average and number of valid data from hourly series; and

(b)

the maximum, 98th and 50th percentile and annual average from a series of daily 8-hour ozone maxima.

Data submitted in monthly reports are considered provisional and shall be updated where necessary in subsequent submissions.