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# Appendix A: Time Averages (NES for Air Quality, Schedule 1)

1-hour mean
1. a mean calculated every hour on the hour for the preceding hour; and
2. b) in relation to a contaminant at a particular location for a particular hour, means the mean of not more than 10-minute means, collected not less than once every 10 seconds, for the contaminant at that location during that hour

24-hour mean

1. a mean calculated every 24 hours at midnight for the preceding 24 hours; and
2. b) in relation to a contaminant at a particular location for a particular 24-hour period, means
1. the mean level at which the contaminant is recorded in the air, by continuous sampling of the air at that location, throughout that 24-hour period; or
2. the mean of the 1-hour means for that contaminant at that location for the preceding 24 hours

running 8-hour mean

1. a mean calculated every hour on the hour for that hour and the preceding 7 hours to give 1 running 8-hour mean per hour; and
2. b) in relation to a contaminant at a particular location for a particular hour, means the mean of the 1-hour means for that contaminant at that location for that hour and the preceding 7 hours.