Heat and Air Quality Filter Into News Cycle

Tuesday, Oct 12, 2010  |  Updated 5:00 PM PDT
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We're Having a Heat Wave

Cheryl Hurd reports

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We're having a heatwave here in Northern California.

It's enough for the National Weather Service to issuu an excessive heat watch in the Bay Area from now until Wednesday evening.
     
You can blame a ridge of high pressure combine with an offshore flow for the exceptionally high temperatures to the city of San Francisco in particular.

Daytime temperatures were expected to reach almost 90 degrees.

The weather also caused the Bay Area Air Quality Management District to issue a Spare  the Air alert for Wednesday.  It's the 10th smog alert this year.

The alert is being issued due to the expected combination of hot temperatures and exhaust from motor vehicles, the district said.
     
The district says vehicle exhaust, gas vapors, industrial emissions and household  chemicals contain volatile components that react with sunlight and oxygen at high temperatures to form ground-level ozone.

Breathing ozone can lead to throat irritation, congestion and  chest pain and can trigger or worsen asthma, bronchitis and emphysema.

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