The Bay Area Air Quality Management District has issued a belated Spare the Air Alert for Wednesday after increased ocean breezes and a fog layer that were forecast to bring improved air quality didn't show up.
The alert is the fourth issued so far for excessive smog accumulation during the air district's summer Spare the Air season that started in April, with the prior three coming on Sunday, Monday and Tuesday as the Bay Area experienced triple-digit temperatures and light winds.
The lack of a strong ocean breeze and fog layer prompted the district to issue the same-day alert to encourage people to limit strenuous outdoor activities and reduce solo driving.
Smog, or ozone, pollution can cause throat and chest problems and is particularly harmful for young children, seniors and those with respiratory or heart conditions, according to the air district.
People can find out when a Spare the Air alert is in effect by visiting 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.