Johnstown
 
Data courtesy of:
 

 
AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action DayAction Day
 
Local Air Quality Resources
 
State Air Quality Resources
Air Quality Partnership of Lehigh Valley - Berks
Air Quality Partnership of the Delaware Valley
Air Quality Partnership of the Susquehanna Valley
American Lung Association (ALA) of Pennsylvania
PA Allergy & Asthma Association
Pennsylvania DEP - BAQ - Contacts
Pennsylvania DEP - BAQ - Current Air Quality Index (AQI) by Area
Pennsylvania DEP - Bureau of Air Quality (BAQ)
Pennsylvania DEP – Air Quality Forecast Home Page
Pennsylvania DEP – Home Page
Southwest PA Air Quality Partnership
Air Quality Forecast
Today's High Tomorrow's High
Air Quality Index (AQI)
40 
Good
Health Message: None
Air Quality Index (AQI)
40 
Good
Health Message: None
AQI - Pollutant Details
Ozone
40 
Good
Ozone
40 
Good
Forecast Discussion: Current Conditions: As of 2 PM on Wednesday, partly sunny skies prevail over the region as high pressure remains in control of our weather. At the same time, a cold front continues to drop south from the Great Lakes toward our region. As a result, the threat of showers and thunderstorms exist through the remainder of today. Right now, westerly flow has helped to keep warm and moist air over our region. Temperatures currently reside in the upper 70s to low 80s with dewpoints hovering in the 60s. Cloud cover continues to limit ozone formation. Expect ozone levels to stay good tomorrow as we see more of Canadian air mass move in over the region. *** Thursday's Forecast: So for Thursday, expect mostly cloudy skies early in the day to give way to clearer skies during the afternoon as the cold front, which pushed through on Wednesday, pushes off to our south and east. At the same time, a new area of high pressure will build in over the Midwestern US. This high will steer our flow out of the north, allowing a cooler, and more importantly drier air mass to build in over our area. As a result, afternoon highs will only peak in the 70s. The combination of the cool and dry air building in from Canada will help to keep ozone confined to the good range. --Nolan

Current Conditions
Air Quality Index (AQI)
observed at 7:00 EDT
16
Good
Health Message: None
AQI - Pollutant Details
Ozone 16 Good
Particles (PM2.5) 4 Good

Past Air Quality Maps and Data
Yesterday's Maps and Data
Air Quality Maps Archives (by region)