| October 31, 2011 | ||||||||
| Max 1-Hour | Hour | Max 8-Hour | Hour | |||||
| Monitoring Site | (ppb) | (EST) | (ppb) | (EST) | ||||
| Bristol | 32 | 12 | 27 | 11 | ||||
| Norristown | 24 | 14 | 17 | 10 | ||||
| Chester | 38 | 16 | 33 | 12 | ||||
| New Garden (Airport) | 31 | 13 | 25 | 9 | ||||
| Allentown | 22 | 13 | 12 | 9 | ||||
| Freemansburg | 26 | 12 | 16 | 8 | ||||
| Easton | 27 | 13 | 16 | 9 | ||||
| Reading Airport | 24 | 13 | ? | 17 | 11 | ? | ||
| Kutztown | 20 | 14 | 12 | 8 | ||||
| Nanticoke | 32 | 13 | 22 | 9 | ||||
| Wilkes-Barre | 30 | 13 | 22 | 11 | ||||
| Scranton | 34 | 12 | 27 | 10 | ||||
| Peckville | 36 | 12 | 28 | 9 | ||||
| Pocono | 29 | 14 | 23 | 10 | ||||
| Lancaster | 30 | 13 | 23 | 10 | ||||
| Lancaster DW | 31 | 12 | 26 | 9 | ||||
| Lebanon | 21 | 11 | 16 | 8 | ||||
| Harrisburg | 23 | 13 | 18 | 10 | ||||
| Hershey | 27 | 14 | 22 | 10 | ||||
| York | 32 | 15 | 26 | 9 | ||||
| York DW | 35 | 1 | 30 | 0 | ||||
| Perry County | 27 | 14 | 20 | 9 | ||||
| Methodist Hill | ? | ? | ||||||
| Altoona | 26 | 15 | 19 | 11 | ||||
| State College | 30 | 12 | 26 | 11 | ||||
| Montoursville | 27 | 15 | 22 | 10 | ||||
| Tioga County | 32 | 6 | 30 | 5 | ||||
| Johnstown | 26 | 14 | 19 | 12 | ||||
| Moshannon | 33 | 13 | 30 | 8 | ||||
| Strongstown | 34 | 12 | 33 | 9 | ||||
| Greensburg | 29 | 11 | 26 | 9 | ||||
| Charleroi | 37 | 16 | 30 | 11 | ||||
| Washington | 39 | 15 | 33 | 9 | ||||
| Holbrook | 40 | 14 | 38 | 12 | ||||
| Florence | 41 | 14 | 37 | 10 | ||||
| Hookstown | 40 | 14 | 37 | 12 | ||||
| Brighton Twp | 37 | 14 | 31 | 11 | ||||
| Beaver Falls | 37 | 14 | 26 | 12 | ||||
| Murrysville | 33 | 16 | 26 | 11 | ||||
| Kittanning | 32 | 16 | 27 | 12 | ||||
| Pittsburgh | 35 | 14 | 30 | 12 | ||||
| New Castle | 33 | 17 | 27 | 12 | ||||
| Farrell | 37 | 16 | 32 | 12 | ||||
| Erie | 33 | 16 | 27 | 10 | ||||
| Philadelphia County Sites | ||||||||
| Frankford (Lab) | 25 | 13 | 20 | 12 | ||||
| Northeast (Airport) | 35 | 14 | 29 | 11 | ||||
| Allegheny County Sites | ||||||||
| Lawrenceville | 31 | 16 | 25 | 11 | ||||
| Harrison Twp | 37 | 17 | 28 | 11 | ||||
| South Fayette | 41 | 15 | 38 | 11 | ||||