![Pollution / Tephra / Volcanic ash / Natural environment / Asthma / Ash / Particulates / Health effects of coal ash / Fly ash Pollution / Tephra / Volcanic ash / Natural environment / Asthma / Ash / Particulates / Health effects of coal ash / Fly ash](https://www.pdfsearch.io/img/1adcd5b0fb8eb769a697c6370377ccec.jpg) Date: 2015-12-16 18:04:42Pollution Tephra Volcanic ash Natural environment Asthma Ash Particulates Health effects of coal ash Fly ash | | Calaveras County Butte Fire Recovery
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