Sunday has been declared a Spare the Air day due to rising inland
temperatures, low winds and automobile emissions, the Bay Area Air Quality
Management District said today.
This is the fifth time this summer that the agency has issued a
Spare the Air alert, which warns of unhealthy levels of ozone.
Ozone is formed when sunlight interacts with motor vehicle exhaust
and gasoline vapors, air district officials said. It can cause throat
irritation, congestion and chest pain, trigger asthma, inflame the linings of
the lung and worsen bronchitis and emphysema.
Residents are advised to avoid driving and limit outdoor exercise
to the early morning hours when ozone levels are lowest.