California Air Resources Board 2006 Almanac (web) Appendix E "Basin Total, Lake Tahoe Air Basin" Table E-7 Category ROG CO NOX SOX PM10 PM2.5 NH3 Natural Sources Total 3 1 0 0 0 0 0 Biogenic Sources 3 0 0 0 0 0 0 Geogenic Sources 0 0 0 0 0 0 0 Wildfires 0 1 0 0 0 0 0