The number of 15-minute PM intervals for which data was collected. The value will typically be equal to the maximum number of 15-minute intervals the implementation is planned to store (i.e., beyond the scope of this MIB module) unless the measurement was (re-)started recently, in which case the value will be the number of complete 15-minute intervals for which the agent has at least some data. In certain cases (e.g., in the case where the agent is a proxy), it is possible that some intervals are unavailable. In this case, this interval is the

maximum interval number for which data is available.