Wood fires are banned in Bay Area fireplaces and stoves Tuesday because a Spare the Air alert has been issued for a second day in a row.

The Bay Area Air Quality Management District said a pattern of cold, stagnant air is trapping smoke and fine particles near the ground, causing predictions of unhealthy air.

Another no-burn alert may be issued for Wednesday as well.

During alerts, it's illegal for Bay Area residents and businesses to burn in their fireplaces, wood stoves, pellet stoves, outdoor fire pits or any other wood-burning devices. An exemption is made for homes without permanently installed heating in areas where wood stoves or fireplaces are the only source of heat.

"Just like cigarette smoke, wood smoke has been linked to asthma, heart problems, cancer and a host of other diseases," said Jack Broadbent, the air district's executive officer.

The agency regulates air pollution in seven Bay Area counties and southern Solano and Sonoma counties.

Contact Denis Cuff at 925-943-8267. Follow him at Twitter.com/deniscuff