Idle Reduction Requirement

The owner or operator of a diesel-powered vehicle must limit the length of time their vehicle remains idle. The limit is based on the outside temperature, as follows: above 32 degrees Fahrenheit, 5-minute limit in any 60-minute period; between 32 and -10 degrees Fahrenheit, 15 minute limit in any 60-minute period; below -10 degrees Fahrenheit, no limit. Certain vehicles are exempt from the regulation, including vehicles in traffic, emergency vehicles, vehicles providing power take-off for refrigeration or lift gate pumps, vehicles idling for required maintenance or diagnostic purposes, and vehicles supplying heat or air conditioning for passenger comfort during transportation.

(Reference New Hampshire Department of Environmental Services, Administrative Rules Env-A 1102.02 and 1102.03)