Paragraph 6 InterpretationI1
Northern Ireland Not yet in force
A 24-hour mean is a mean calculated every 24 hours. The 24 hour mean for a particular substance at a particular location for a particular 24 hour period is the level at which that substance is recorded as being present in the air at that location on the basis of a continuous sample of air taken throughout the period.
Annotations
Commencement
- I1
Sch. para. 6 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