Worst air pollution Porterville, today and tomorrow
Today (9 August): Air quality in Porterville is fair. PM2.5, NO2, and PM1 are fair; AQI and O3 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 5:00 AM (O3: 42.1/100).
Tomorrow (10 August 2026): Air quality in Porterville is fair. AQI worsens to fair; O3 increases to fair; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 8:00 AM (O3: 36.4/100). Airmine updates local air quality forecasts four times daily.
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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 - 9 August | Pollution peaks at 05:00
AQI:
Medium
42.1/100
PM2.5 (fine particles):
Fair
28.1/100
PM10 (coarse particles):
Good
10.7/100
NO2 (nitrogen dioxide):
Fair
35.0/100
O3 (ozone):
Medium
42.1/100
SO2 (sulfur dioxide):
Good
14.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Fair
25.4/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 08:00
AQI:
Fair
36.4/100
PM2.5 (fine particles):
Fair
24.9/100
PM10 (coarse particles):
Good
9.7/100
NO2 (nitrogen dioxide):
Fair
26.7/100
O3 (ozone):
Fair
36.4/100
SO2 (sulfur dioxide):
Good
11.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.3/100
PM1 (ultrafine particles):
Good
19.6/100
Pollen forecast in Porterville
View pollen forecastFrequently Asked Questions
Is air quality bad in Porterville right now?
On 9 August 2026, overall air quality in Porterville is fair. NO2 is the main pollutant at 35.0/100. Pollution peaks around 5:00 AM (O3: 42.1/100).
Will air quality be worse tomorrow in Porterville?
On 10 August 2026, air quality conditions in Porterville will be similar to today, with AQI forecast at fair at 36.4/100. Pollution peaks around 8:00 AM (O3: 36.4/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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