Paragraph 7 InterpretationI1
Northern Ireland Not yet in force
A 15-minute mean is a mean calculated every 15 minutes. The 15 minute mean for a particular substance at a particular location for a particular 15 minutes is the mean of the levels recorded, at a frequency of not les than once every 10 seconds, for that substance at that location during that 15 minutes.
Annotations
Commencement
- I1
Sch. para. 7 in operation at 1.9.2003, see reg. 1(1)
Notes on Schedule
Textual amendments
- F1
words in Sch. substituted (1.1.2004) by Air Quality (Amendment) Regulations (Northern Ireland) 2003 (S.R. 2003/543), regs. 1, 2
Footnotes
- f1
*
μg/m3: micrograms per cubic metre
ppb/ppm: parts per billion/million
mg/m3: milligrams per cubic metre