SAN FRANCISCO (CBS SF) — Air quality is forecast to be unhealthy for a second day in a row  in the Bay Area, prompting another Spare the Air alert for Sunday, according  to Bay Area air quality officials.


The alert, issued by the Bay Area Air Quality Management District,  means that air quality is expected to be poor and residents are advised to  reduce driving and avoid outdoor activities during the hottest parts of the  day.


An alert is already in effect Saturday. Sunday’s smog alert is the  ninth of 2012.


Residents in the East, North and South bay regions are advised to  be particularly mindful of ozone pollution, officials said.


The alert often coincides with warm weather but other factors  contribute to poor air quality, officials said.


Ozone can cause throat irritation, congestion, chest pain and  inflammation of the lining of the lungs. Those with asthma, bronchitis and  emphysema are especially vulnerable, as are young children, seniors and those  with respiratory and heart conditions.


Residents are asked to avoid driving on Spare the Air days and  find alternate transit options, including biking, carpooling or taking public  transit.


There is no free transit offered, and a no wood-burning ban is in  place.


Sunday’s forecast includes temperatures reaching into the upper  90s and lower 100s inland and into the 70s and lower 80s along the coast as  part of a rapid warm-up expected in the area through Tuesday, according to  the National Weather Service.


In anticipation of the heat wave, Morgan Hill police posted an  online notice about a cooling center open today and through the next few days  at the Centennial Recreation Senior Center at 171 W. Edmundson Ave. in Morgan  Hill.


The center will be open today until 8 p.m.


On Sunday the center will be open between 8 a.m. and 6 p.m. for  residents to take a break from the heat and during weekdays between 5 a.m.  and 10 p.m.


(Copyright 2012 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)


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