If it is likely that the ambient air quality standard for a contaminant will be breached in an airshed, the regional council must—
(a) monitor the airshed in relation to that contaminant; and
(b) conduct the monitoring—
(i) in that part of the airshed where—
(A) there are one or more people; and
(B) the standard is breached by the greatest margin or the standard is breached the most frequently, whichever is the most likely; and
(ii) in accordance with the relevant method listed in Schedule 2.