BANNING (CBSLA.com) — Authorities issued a smoke advisory for parts of Riverside County most affected by the Silver Fire.

Residents were advised to avoid unnecessary outdoor activity as the 19,000 acre wildfire is moving east.

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Ares affected include the Banning Pass, Coachella and San Jacinto Valley, said Tina Cox, of the South Coast Air Quality Management District.

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The smoke and ash could cause air quality in those areas to hit the unhealthy range or higher, Cox said.

People with respiratory problems and heart disease, as well as the elderly and children, were advised to remain indoors.

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