The fires burning in Calaveras and Tuolumne County caused air quality officials to issue a smoke advisory, warning people that the air quality may be unhealthy for sensitive groups.

Due to smoke from the TCU September Lightning Complex fires , areas in Angels Camp and Copperopolis are experiencing an air quality index of 170 or more, which indicates unhealthy air quality for sensitive groups, officials said.

The smoke advisory issued by the Calaveras County Air Pollution Control District is scheduled to expire at noon on Thursday. But officials said it could be extended depending on conditions.

In Tuolumne County, officials issued an air quality advisory through Friday. Residents can check the air quality in their city online .

The smoke may also affect all areas of the county, a

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