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Type correctness means that the program produces results of the given type whenever it is applied to data of the given type . It urges that agencies adopt scientifically consistent definitions and standards , and that a single agency exercise responsibility over a given product whenever possible . Uniqueness holds for the given partitions whenever the countable family is not that of the star graphs . ITS reserves the right to remove an account from a given machine whenever the machine 's resources are needed for more urgent purposes . In particular , we propose a method for determining a sampling duration that will yield the " best estimate " of the mean concentration for a given cost whenever appropriate statistical assumptions hold.Implications : Monitoring of air quality related variables has become a routine effort as part of strategies for protecting human health and welfare .