The report, by Michael J. Karter, Jr., says that in 2010, U.S. fire departments responded to 2,187,000 false alarms. This was a slight increase of 0.4%. This means that one out of ten calls responded to by fire departments were false alarms.
The new report includes a table on fire department calls by type of call. Download your free copy of NFPA's "False Alarm Activity in the U.S. 2010" report.