Worst air pollution Porterville, today and tomorrow
Today (15 July): Air quality in Porterville is fair. PM2.5 and PM1 are fair; AQI, NO2, and O3 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 8:00 AM (O3: 59.9/100).
Tomorrow (16 July 2026): Air quality in Porterville is fair. All pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 56.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Porterville's air quality reflects the San Joaquin Valley's enclosed basin position at the Sierra Nevada foothills, with vehicle emissions from SR-65 and surrounding citrus and olive farming operations contributing PM2.5. The Sierra foothills position provides marginally better conditions than the flat valley floor, while persistent valley inversions continue to trap winter emissions and summer ozone from the valley's combined agricultural and vehicle sources produces some of California's highest readings.
Today - 15 July | Pollution peaks at 08:00
AQI:
Medium
59.9/100
PM2.5 (fine particles):
Fair
26.8/100
PM10 (coarse particles):
Good
15.3/100
NO2 (nitrogen dioxide):
Medium
42.0/100
O3 (ozone):
Medium
59.9/100
SO2 (sulfur dioxide):
Good
14.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.7/100
PM1 (ultrafine particles):
Fair
25.3/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 17:00
AQI:
Medium
56.6/100
PM2.5 (fine particles):
Fair
32.0/100
PM10 (coarse particles):
Good
16.3/100
NO2 (nitrogen dioxide):
Medium
56.6/100
O3 (ozone):
Medium
54.3/100
SO2 (sulfur dioxide):
Good
16.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.8/100
PM1 (ultrafine particles):
Fair
29.2/100
Pollen forecast in Porterville
View pollen forecastFrequently Asked Questions
Is air quality bad in Porterville right now?
On 15 July 2026, overall air quality in Porterville is fair. PM2.5 is the main pollutant at 26.8/100. Pollution peaks around 8:00 AM (O3: 59.9/100).
Will air quality be worse tomorrow in Porterville?
On 16 July 2026, air quality conditions in Porterville will be similar to today, with PM2.5 forecast at fair at 32.0/100. Pollution peaks around 5:00 PM (NO2: 56.6/100).
When is air pollution at its worst in Porterville?
Conditions in Porterville vary noticeably across the seasons — winter rains provide the only real relief from an otherwise persistent haze, whereas summer and early autumn bring the highest ozone levels, and wildfire smoke can spike particulate readings sharply from August through October. The mountains ringing the basin can trap pollution close to the ground for days when winds are calm.
Are air quality levels in Porterville based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app