Lambton Public Health says Ontario's new Air Quality Health Index provides more accurate information on pollutants to keep residents healthy.
Much like the UV index, the health index uses a scale from one to ten, with lower numbers representing better air quality.
Supervisor Lori Lucas says when the AQI is high, there are a number of things people can do to keep safe.
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There have been no reported smog days in Sarnia since 2012.
The new system was launched Wednesday.
