Air samples needed to calculate bext were collected at least every six days at D.L. Bliss State Park. This is an appropriate site for monitoring regional conditions because it is not influenced by urban sources ((L.-W. Antony Chen, Watson, John G., and Wang, Xiaoliang 2011)). Data are collected, analyzed, and reported by the IMPROVE (national Interagency Monitoring of Protected Environments) network using nationally accepted protocols.