This report represents 2004 annual air quality information for all states in New England. The majority of the data, included in this report, were submitted to EPA by the states from their ambient monitoring networks in accordance with 40 CFR 58. The only data from industrial monitors, which have been included, are from the Massachusetts Industrial Network, EPA-required networks in New Hampshire and Maine's licensing program. These industrial sites supplement the state networks. This report reflects the status of the AIRS database as of May 2005. The majority of data used have been evaluated and verified by EPA. However, for those monitors that appear to be violating an applicable ambient air quality standard, the data may require further evaluation by both EPA and the states.