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. |
| 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:
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
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.