Montgomery County firefighters aim to arrive on the scene of a fire in six minutes or less — but they only do that about half of the time, according to newly released data. In urban areas, which generally have the fastest response times, the first engine arrived within six minutes for 55 percent of the 607 calls in the last fiscal year, the data show. For suburban and rural areas, that percentage dropped to 33 and 29 percent of 131 an 21 calls, respectively.

That means that for about 376 calls, the county’s Fire and Rescue Service took longer than six minutes to respond in fiscal 2011.