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AirHistory

What Is the Air Quality in Tioga, Pennsylvania?

Tioga, Pennsylvania has an Air Quality Grade of B (good) with a 5-year median AQI of 39. The dominant pollutant is Ground-Level Ozone, and air quality has been improving over the past decade.

Tioga, Pennsylvania Air Quality Snapshot

Air Quality GradeB70/100
5-Year Median AQI39 (Good)
Most Recent Median AQI (2023)41 (Good)
Dominant PollutantGround-Level Ozone
10-Year TrendImproving (-0.39 AQI/yr)
Unhealthy Days (last 5 yr)1
National Rank (cleanest = #1)#413 of 1,020 (40th cleanest percentile)
Pennsylvania Rank#12 of 40

What Does the B Grade Mean?

Tioga, Pennsylvania earns a B — air quality is reliably in the safe range for most residents most of the time, with a 5-year median AQI of 39. Sensitive groups will see occasional caution days, but the typical resident will not need to change behavior based on air quality.

Tioga, Pennsylvania's 5-year median AQI of 39 is 2 points below the national average of 41 — meaningfully cleaner than the typical U.S. metro tracked here. Within Pennsylvania, Tioga, Pennsylvania runs cleaner than the state average of 43 — a positive signal that local conditions (terrain, wind patterns, emission sources) are working in residents' favor.

For context within Pennsylvania: Wyoming, Pennsylvania currently holds the state's cleanest grade (A, AQI 33), while Allegheny, Pennsylvania sits at the bottom (C, AQI 56).

What's in Tioga, Pennsylvania's Air?

The dominant pollutant in Tioga, Pennsylvania is Ground-Level Ozone. Ground-level ozone forms when sunlight reacts with vehicle exhaust and industrial emissions. It is worst on hot, sunny, stagnant summer days. Ozone irritates the lungs, triggers asthma attacks, and reduces lung function — even healthy adults can feel chest tightness and shortness of breath after exercising in elevated ozone.

Days by Dominant Pollutant (2023)

PollutantDays as DominantShare of Year
Ground-Level Ozone24280%
Fine Particulate Matter (PM2.5)6220%

Is the Air Getting Better or Worse?

Air quality in Tioga, Pennsylvania has been improving over the past decade, with median AQI dropping by roughly 0.4 points per year. That is consistent with the broader national pattern — most U.S. metros have seen steady reductions in particulate and ozone pollution since the 2010s as cleaner vehicles and power plants come online.

In 2014, Tioga, Pennsylvania posted a median AQI of 38. By 2023 that figure was 41 — a rise of 3 AQI points dirtier across 10 years of EPA records.

Year-by-Year AQI in Tioga, Pennsylvania

YearMedian AQIGood DaysUnhealthy DaysDominant Pollutant
2014383260Ozone
2015442240PM2.5
2016412802Ozone
2017531500PM2.5
2018372860Ozone
2019373170Ozone
2020392980Ozone
2021382741Ozone
2022392480Ozone
2023412540Ozone

Health Context for Tioga, Pennsylvania

Across the past five years, this area has logged just 1 days where AQI rose into the "Unhealthy for Sensitive Groups" range or worse — about 0 days per year, or roughly one every other month. That is a low count by national standards.

For most healthy adults, current air quality in this area does not require any change in behavior. People with severe asthma, COPD, or recent cardiac events should still keep an eye on daily AQI alerts, especially during wildfire season. Because ozone peaks in the afternoon on hot sunny days, plan outdoor exercise for early morning or after sunset on bad-air days.

How This Grade Is Calculated

The AirHistory Air Quality Grade combines four signals: the 5-year median AQI (40% of the score), the 10-year trend direction (30%), the count of unhealthy days per year (20%), and the dominant pollutant type (10%). All four come directly from the EPA Air Quality System (AQS), which aggregates readings from federally certified monitors. Read the full methodology.

Tioga, Pennsylvania has an Air Quality Grade of B (good) with a 5-year median AQI of 39. The dominant pollutant is Ground-Level Ozone, and air quality has been improving over the past decade.

This answer pulls from the EPA Air Quality System (AQS), the authoritative federal source for U.S. air quality and pollution monitoring. The headline number above is the direct answer; what follows is the additional context most readers need to use the answer for a real decision rather than just a fact lookup.

A practical caveat: the headline answer above reflects the most recent the EPA Air Quality System (AQS) vintage; underlying data is often revised for months after first publication, and the right reference for any specific decision is whichever vintage is current at the time of the decision. The as-of date is stamped on every page.

Source: EPA Outdoor Air Quality Data, 2026.