High temperatures and light winds forecast in the Bay Area for Thursday have prompted the Bay Area Air Quality Management District to issue a Spare the Air alert.
Thursday's alert is the 13th the air district has issued for the summer Spare the Air season. The alerts are issued whenever weather conditions are expected to combine with motor vehicle exhaust to create elevated levels of ozone, or smog.
On Spare the Air days, the air district encourages people to avoid solo vehicle trips and to find other alternatives such as sharing rides, taking transit or biking or walking.
Outdoor exercise is advised only in the early morning hours when ozone concentrations are lower, according to the air district.
Inland temperatures by Thursday and Friday will be in the 90s throughout the region, with some areas reaching the 100s, according to the National Weather Service.
Along the coast, temperatures are expected to reach the 70s and 80s, but those temperatures could be even higher if the winds blow from east to west.
Weather service officials said the increased temperatures may catch some people by surprise since it has been so cool recently.
Moderate to locally high risks for heat impacts will develop inland, and low to locally moderate risks will develop along the coast.
According to the weather service, temperatures in the hills and mountains will still be mild overnight Thursday and Friday. Temperatures are expected to cool gradually on Saturday and then even more on Sunday.
Wildfire concerns will be low because of generally light winds, weather service officials said.
People can find out when a Spare the Air alert is in effect by registering for emails at sparetheair.org, calling 800-HELP-AIR (4357-247), downloading the Spare the Air smartphone app for iPhone or Android devices or connecting with Spare the Air on Facebook, Twitter or YouTube.