Don't miss science reporter and weather blogger Frank Roylance's story about smoke detectors today.

Last year 23 people died in Baltimore due to fire --- more than any year since 2001. It's not clear whether there were working smoke detectors in many of these homes.

While fire officials emphasize that while any detector is better than none, some say ionizing alarms, the most common --- and cheapest --- variety of smoke detectors, are less likely to trigger during certain types of smoldering fires. Plus, they are more likely to sound due to cooking smoke, and as a result people often disable them ... so they're not functioning when fires actually occur.

"Every night before I fall asleep I say a prayer for the two or three people I know are going to die that night because they have the wrong smoke detector," said Deputy Chief Joseph M. Fleming of the Boston Fire Department.

Fleming is an outspoken advocate for alarms that use an alternative "photoelectric" technology to sense smoke. Photoelectrics cost slightly more, he said, but they're quicker to sense smoldering fires and less prone to nuisance alarms. Although ionization alarms are faster at detecting flaming fires, he said, the advantage is a small one. 

A dual alarm might be your best option, according to the Consumers Union, which publishes Consumer Reports.