Posted by Jane Clark

SMOG LEVELS RISE WITH RECENT HEAT

The public can check current levels and learn more about protecting air
quality by logging on to www.iowacleanair.com, the DNR's air quality
website.

DES MOINES - Recent hot, humid weather is increasing smog levels this week,
according to DNR officials.

So far the lung-irritating gas hasn't reached unhealthy levels, but it has
come close, especially in areas of eastern Iowa, said Brian Button, an air
information specialist with the DNR.

He said heat and sunshine can transform air emissions from vehicles,
factories and other sources into ozone, the main chemical in smog. It can be
an eye and respiratory irritant, burn lung tissue and trigger asthmatic
attacks.

The AQI, or Air Quality Index ranks air quality into good, moderate and
several classes of unhealthy levels. The AQI fell between 80 to 100 at
different times this week in eastern Iowa, while most of June was below 50.
Values over 100 are unhealthy for sensitive groups such as people with
respiratory problems and children.

"We've definitely seen a rise in the AQI due to higher smog. Hopefully
moderate levels will persist during this hot spell and unhealthy levels
avoided," explained Button. The state will issue an advisory if unhealthy
levels are detected. "The advisory gives people the option of avoiding
prolonged, outdoor activity to reduce exposure. That's most important for
those with lung disease and asthma," he said.

Last summer, several health advisories were issued.

The public can check current levels and learn more about protecting air
quality by logging on to www.iowacleanair.com, the DNR's air quality
website.

For more information, contact Brian Button at (515) 281-7832.

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