SmogRank / Episodes / United States

Pennsylvania, United States, February 2026

For 1 day, on 6 February 2026, 11 cities in the United States had PM2.5 at least twice their usual for the time of year. The worst reading was New Holland, Pennsylvania, United States: 47.9 µg/m³ on 6 February, about 3.9× its usual 12.2. Ended 6 February.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached11in 1 country
Days16 February 2026
Worst day6 February11 cities counted
Furthest above usual3.9×New Holland

Day by day

6 February 11 cities at twice their usual or more
Kennett SquareNewarkElktonAllentownGlasgowHunt ValleyEdgewoodBearWilmingtonNorristownClaymontEssexChesterBaltimorePaulsboroPhiladelphiaAbingtonCamdenSewellPennsaukenScrantonPalmyraScaggsvilleBensalemSouth LaurelDoverEwingRockvilleSouth VinelandTrentonHagerstownWashingtonHalfwayOxon Hill-GlassmanorState CollegeRose HillAshburnCambridgeMendhamSpringfieldSeafordRandolphNew BrunswickPleasantvilleSmithvilleLindenAtlantic CityElizabethToms RiverAltoonaBayonnePatersonJersey CityNew York CityFort LeeMount IvyNew CityNewburghWhite PlainsJohnstownFrostburgDanburyCharlottesvilleHarrisonburgBridgeportHolbrookWarrenGreensburgAlbanyUniontownNatrona HeightsWaterburyNew HavenMcKeesportWest MifflinWilkinsburgMonessenJefferson HillsPittsburghPittsfieldUpper Saint ClairKennedy TownshipBridgevilleHartfordCanonsburgNorth AdamsNew BrightonBeaver FallsSpringfieldNorth ChicopeeErieWeirton HeightsHermitageWeirtonNew LondonGreenfieldSteubenvilleYoungstownMoundsvilleWareWarrenCoventryWest GreenwichWorcesterUxbridgeProvidenceMilfordPawtucketFraminghamLebanonHersheyHarrisburgBethlehemReadingLancasterWyomissingCarlisleYorkSchlusserNew Holland
3 Feb456789
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

New HollandNew Holland, 3 February: 28.5 µg/m³New Holland, 4 February: 25.7 µg/m³New Holland, 5 February: 29.4 µg/m³New Holland, 6 February: 47.9 µg/m³, 3.9× its usual 12.2New Holland, 7 February: 7.2 µg/m³New Holland, 8 February: 3.4 µg/m³New Holland, 9 February: 9.8 µg/m³LancasterLancaster, 3 February: 24.6 µg/m³Lancaster, 4 February: 18.8 µg/m³Lancaster, 5 February: 17.0 µg/m³Lancaster, 6 February: 33.3 µg/m³, 3.4× its usual 9.7Lancaster, 7 February: 6.1 µg/m³Lancaster, 8 February: 3.2 µg/m³Lancaster, 9 February: 7.3 µg/m³YorkYork, 3 February: 27.2 µg/m³York, 4 February: 20.1 µg/m³York, 5 February: 21.8 µg/m³York, 6 February: 32.2 µg/m³, 3.5× its usual 9.1York, 7 February: 6.6 µg/m³York, 8 February: 4.1 µg/m³York, 9 February: 10.7 µg/m³SchlusserSchlusser, 3 February: 18.5 µg/m³Schlusser, 4 February: 14.0 µg/m³Schlusser, 5 February: 21.6 µg/m³Schlusser, 6 February: 32.0 µg/m³, 3.8× its usual 8.4Schlusser, 7 February: 3.1 µg/m³Schlusser, 8 February: 2.7 µg/m³Schlusser, 9 February: 9.1 µg/m³CarlisleCarlisle, 3 February: 18.5 µg/m³Carlisle, 4 February: 14.0 µg/m³Carlisle, 5 February: 21.6 µg/m³Carlisle, 6 February: 32.0 µg/m³, 3.5× its usual 9.2Carlisle, 7 February: 3.1 µg/m³Carlisle, 8 February: 2.7 µg/m³Carlisle, 9 February: 9.1 µg/m³WyomissingWyomissing, 3 February: 16.9 µg/m³Wyomissing, 4 February: 14.1 µg/m³Wyomissing, 5 February: 16.5 µg/m³Wyomissing, 6 February: 29.2 µg/m³, 3.5× its usual 8.4Wyomissing, 7 February: 6.9 µg/m³Wyomissing, 8 February: 2.8 µg/m³Wyomissing, 9 February: 6.7 µg/m³ReadingReading, 3 February: 16.9 µg/m³Reading, 4 February: 14.1 µg/m³Reading, 5 February: 16.5 µg/m³Reading, 6 February: 29.2 µg/m³, 3.4× its usual 8.6Reading, 7 February: 6.9 µg/m³Reading, 8 February: 2.8 µg/m³Reading, 9 February: 6.7 µg/m³HarrisburgHarrisburg, 3 February: 17.8 µg/m³Harrisburg, 4 February: 13.5 µg/m³Harrisburg, 5 February: 17.8 µg/m³Harrisburg, 6 February: 28.9 µg/m³, 3.1× its usual 9.4Harrisburg, 7 February: 4.3 µg/m³Harrisburg, 8 February: 2.9 µg/m³Harrisburg, 9 February: 7.2 µg/m³HersheyHershey, 3 February: no readingHershey, 4 February: no readingHershey, 5 February: 17.6 µg/m³Hershey, 6 February: 27.9 µg/m³, 3.0× its usual 9.4Hershey, 7 February: 4.6 µg/m³Hershey, 8 February: 3.1 µg/m³Hershey, 9 February: 6.9 µg/m³LebanonLebanon, 3 February: 16.8 µg/m³Lebanon, 4 February: 14.9 µg/m³Lebanon, 5 February: 16.9 µg/m³Lebanon, 6 February: 27.7 µg/m³, 3.0× its usual 9.3Lebanon, 7 February: 6.0 µg/m³Lebanon, 8 February: 3.1 µg/m³Lebanon, 9 February: 8.6 µg/m³BethlehemBethlehem, 3 February: 18.3 µg/m³Bethlehem, 4 February: 10.7 µg/m³Bethlehem, 5 February: 13.3 µg/m³Bethlehem, 6 February: 26.6 µg/m³, 3.3× its usual 8.0Bethlehem, 7 February: 9.3 µg/m³Bethlehem, 8 February: 3.2 µg/m³Bethlehem, 9 February: 6.3 µg/m³3 Feb456789
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
New HollandPennsylvania, United States1 47.96 February12.23.9×
SchlusserPennsylvania, United States1 32.06 February8.43.8×
YorkPennsylvania, United States1 32.26 February9.13.5×
CarlislePennsylvania, United States1 32.06 February9.23.5×
WyomissingPennsylvania, United States1 29.26 February8.43.5×
LancasterPennsylvania, United States1 33.36 February9.73.4×
ReadingPennsylvania, United States1 29.26 February8.63.4×
BethlehemPennsylvania, United States1 26.66 February8.03.3×
HarrisburgPennsylvania, United States1 28.96 February9.43.1×
HersheyPennsylvania, United States1 27.96 February9.43.0×
LebanonPennsylvania, United States1 27.76 February9.33.0×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in the United States

Number 108 of 151 episodes in the United States since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 151.

Use this page

SmogRank, Pennsylvania, United States, February 2026: 11 cities with PM2.5 at twice their usual or more, 6 February 2026, smogrank.com/episodes/2026-02-pennsylvania-united-states (accessed 5 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.