| April 28, 2024 | |||||||||
| Monitoring Site Information | Max 1-Hour | Hour | Max 8-Hour | AQI | Hour | ||||
| Site Name | County | (ppb) | (EST) | (ppb) | (EST) | ||||
| PA DEP Monitors | |||||||||
| Southeastern Pennsylvania | |||||||||
| Bristol | Bucks | 63 | 15 | 53 | 49 | 12 | |||
| New Garden (Airport) | Chester | 54 | 17 | 47 | 44 | 13 | |||
| Chester | Delaware | 50 | 16 | 43 | 40 | 11 | |||
| Norristown | Montgomery | 51 | 16 | 47 | 44 | 13 | |||
| Northeastern Pennsylvania | |||||||||
| Peckville | Lackawanna | 46 | 15 | 41 | 38 | 11 | |||
| Scranton | Lackawanna | 44 | 15 | 38 | 35 | 10 | |||
| Allentown | Lehigh | 44 | 15 | 42 | 39 | 12 | |||
| Swiftwater | Monroe | 55 | 14 | 48 | 44 | 11 | |||
| Freemansburg | Northampton | 45 | 15 | 42 | 39 | 12 | |||
| Southcentral Pennsylvania | |||||||||
| Arendtsville | Adams | 49 | 15 | 46 | 43 | 15 | |||
| Kutztown | Berks | 47 | 17 | 40 | 37 | 11 | |||
| Reading Airport | Berks | 50 | 16 | 41 | 38 | 12 | |||
| Altoona | Blair | 50 | 16 | 48 | 44 | 10 | |||
| Harrisburg | Dauphin | 46 | 17 | 41 | 38 | 13 | |||
| Hershey | Dauphin | 46 | 17 | 42 | 39 | 11 | |||
| Methodist Hill | Franklin | 44 | 21 | 42 | 39 | 14 | |||
| Lancaster | Lancaster | 53 | 15 | 49 | 45 | 12 | |||
| Lancaster DW | Lancaster | 51 | 14 | 47 | 44 | 12 | |||
| Lebanon | Lebanon | 42 | 15 | 37 | 34 | 11 | |||
| York | York | 53 | 16 | 48 | 44 | 13 | |||
| York DW | York | ? | |||||||
| Northcentral Pennsylvania | |||||||||
| Towanda | Bradford | 48 | 12 | 43 | 40 | 9 | |||
| State College | Centre | 57 | 14 | 55 | 51 | 12 | |||
| Montoursville | Lycoming | 40 | 15 | 33 | 31 | 10 | |||
| Tioga County | Tioga | 51 | 14 | 45 | 42 | 9 | |||
| Southwestern Pennsylvania | |||||||||
| Beaver Falls | Beaver | 46 | 12 | 45 | 42 | 9 | |||
| Brighton Twp | Beaver | 51 | 16 | 50 | 46 | 10 | |||
| Fort Mcintosh | Beaver | 46 | 16 | 44 | 41 | 9 | |||
| Uniontown | Fayette | 56 | 17 | 53 | 49 | 10 | |||
| Johnstown | Cambria | 51 | 16 | 49 | 45 | 10 | |||
| Holbrook | Greene | 55 | 18 | 53 | 49 | 11 | |||
| Charleroi | Washington | 50 | 17 | 47 | 44 | 10 | |||
| Florence | Washington | 47 | 16 | 45 | 42 | 9 | |||
| Houston | Washington | 51 | 16 | 49 | 45 | 10 | |||
| Greensburg | Westmoreland | 47 | 13 | 46 | 43 | 10 | |||
| Northwestern Pennsylvania | |||||||||
| Kittanning | Armstrong | 52 | 16 | 50 | 46 | 10 | |||
| Erie | Erie | 45 | 18 | 40 | 37 | 11 | |||
| Strongstown | Indiana | 52 | 12 | 51 | 47 | 10 | |||
| Farrell | Mercer | 50 | 17 | 48 | 44 | 10 | |||
| Allegheny County Monitors | |||||||||
| Lawrenceville | 50 | 13 | 47 | 44 | 9 | ||||
| Harrison Twp | 54 | 14 | 50 | 46 | 9 | ||||
| South Fayette | 52 | 12 | 50 | 46 | 9 | ||||
| Philadelphia County Monitors | |||||||||
| NE Airport (Northeast Phila) | 57 | 15 | 48 | 44 | 11 | ||||
| NE Waste (Eastcentral Phila) | 60 | 15 | 52 | 48 | 12 | ||||
| AMS Lab (Eastcentral Phila) | ? | ||||||||
| CASTNET Sites | |||||||||
| Arendtsville (ARE128) | Adams | 50 | 15 | 48 | 44 | 15 | |||
| Penn State (PSU106) | Centre | 56 | 14 | 53 | 49 | 11 | |||
| Kane Exp. Forest (KEF112) | Elk | 49 | 13 | 45 | 42 | 10 | |||
| M.K. Goddard (MKG113) | Mercer | 49 | 11 | 47 | 44 | 9 | |||
| Laurel Hill (LRL117) | Somerset | 53 | 15 | 51 | 47 | 9 | |||