The Bay Area Air Quality Management District has declared a third consecutive Spare the Air day today due to anticipated unhealthy levels of ozone.
A Spare the Air day means drivers should carpool with friends or co-workers, or telecommute if possible. Drivers are also asked to link necessary trips and postpone errands.
High levels of ozone can cause throat and lung irritation, or trigger asthma, and can be especially harmful for young children, seniors and those with respiratory and heart conditions, according to the Air District.
Ozone is formed at ground level when compounds from car exhaust, industrial emissions and household chemicals combine with oxygen on hot and sunny days.
Today will be the 13th Spare the Air day declared by the Air District this summer.
A heat advisory remains in effect through 11 p.m. tonight for Pleasanton and the Tri-Valley, where the temperature ios expected to reach 99 degrees by 3 p.m. today. Variable winds of
5 to 10 mph are anticipated.
Tonight the Tri-Valley is expected to be mostly clear with patchy clouds developing after midnight. Low temperatures in the 50s and variable winds of 5 to 10 mph are anticipated.
Wednesday the Tri-Valley is expected to be mostly sunny with some areas of patchy fog in the morning. High temperatures in the mid 90s and variable winds of 5 to 10 mph are anticipated.