| Site Code | Site Name | Longitude (degrees) | Latitude (degrees) | UTM easting Zone 10 (km) | UTM Northing Zone 10 (km) | UTM Easting Zone 11 (km) | UTM Northing Zone 11 (km) | Elevation MSL (m) |
| GVL | Grass Valley-Litton | -121.031 | 39.131 | 670.196 | 4332.930 | 151.524 | 4338.827 | 853 |
| TRU | Truckee-Fire Station | -120.170 | 39.339 | 743.908 | 4357.964 | 226.783 | 4358.938 | 1676 |
| QUC | Quincy-267 N Church St | -120.938 | 39.938 | 676.183 | 4422.646 | 163.491 | 4428.041 | 1067 |
| CHM | Chico-Manzonita | -121.847 | 39.756 | 598.772 | 4401.147 | 84.693 | 4411.760 | 61 |
| CSS | Colusa-100 Sunrise Blvd | -122.017 | 39.203 | 584.879 | 4339.534 | 66.689 | 4351.082 | 17 |
| YAS | Yuba City-Almond St | -121.618 | 39.139 | 619.441 | 4332.892 | 100.804 | 4342.149 | 20 |
| ROC | Rocklin-5000 Rocklin Rd | -121.217 | 38.789 | 654.860 | 4294.653 | 133.679 | 4301.597 | 100 |
| SST | Sacramento-Health Dept | -121.458 | 38.554 | 634.365 | 4268.228 | 111.465 | 4276.532 | 8 |
| S13 | Sacramento-1309 T St | -121.492 | 38.568 | 631.377 | 4269.721 | 108.576 | 4278.220 | 7 |
| SJ4 | San Jose-4th St | -121.888 | 37.340 | 598.503 | 4132.967 | 66.879 | 4143.608 | 24 |
| BAC | Bakersfield-5558 California St |
-119.060
|
35.361 | 858.048 | 3919.988 | 312.833 | 3914.805 | 120 |
| SMY | Santa Maria-Broadway | -120.434 | 34.948 | 734.332 | 3870.097 | 186.372 | 3872.478 | 76 |
| ATL | Atascadero-Lewis Ave | -120.668 | 35.492 | 711.542 | 3929.874 | 167.221 | 3933.563 | 262 |
The plot below shows 24-hour averages of the hourly PM10 concentrations for all of the sites. Two important features can be clearly seen in this plot. During the period from April 19 through April 24th, all of the sites experienced elevated concentrations of particulate. From newspaper articles and conversations with air pollution management organizations, this was due to the combination of several forest fires in Idaho and Oregon. The Asian dust affected the regional pollution levels during the period April 25, 1998 through May 2, 1998. All sites indicated relatively high concentrations with Truckee and Bakersfield recording the highest.
The plot below shows the same data set but all hourly measurements. The Truckee site is characterized by the highest diurnal variations of all the sites because of the local sources impacting the site. This type of plot illustrates the impact of local sources as well as large scale regional sources.
