Worst air pollution Mariposa, today and tomorrow
Today (9 August): Air quality in Mariposa is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 AM (O3: 30.1/100).
Tomorrow (10 August 2026): Air quality in Mariposa is fair. PM2.5 decreases to good; all other pollutants stay as today. Pollution peaks around 11:00 PM (O3: 34.8/100). 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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Mariposa experiences air quality conditions shaped chiefly by Sierra foothill wildfire smoke, and wildfire smoke in dry summers is the leading regional concern. Day-to-day conditions in Mariposa can still vary with local weather, wind direction, and time of year. Visitors and residents alike tend to notice the clearest air outside the warmest summer weeks.
Today - 9 August | Pollution peaks at 06:00
AQI:
Fair
30.1/100
PM2.5 (fine particles):
Fair
20.6/100
PM10 (coarse particles):
Good
8.0/100
NO2 (nitrogen dioxide):
Good
11.9/100
O3 (ozone):
Fair
30.1/100
SO2 (sulfur dioxide):
Good
7.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
1.8/100
PM1 (ultrafine particles):
Good
13.5/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 23:00
AQI:
Fair
34.8/100
PM2.5 (fine particles):
Good
18.0/100
PM10 (coarse particles):
Good
8.4/100
NO2 (nitrogen dioxide):
Good
7.1/100
O3 (ozone):
Fair
34.8/100
SO2 (sulfur dioxide):
Good
6.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.0/100
PM1 (ultrafine particles):
Good
12.0/100
Pollen forecast in Mariposa
View pollen forecastFrequently Asked Questions
Is air quality bad in Mariposa right now?
On 9 August 2026, overall air quality in Mariposa is fair. AQI is the main air quality indicator at 30.1/100. Pollution peaks around 6:00 AM (O3: 30.1/100).
Will air quality be worse tomorrow in Mariposa?
On 10 August 2026, air quality conditions in Mariposa will be similar to today, with AQI forecast at fair at 34.8/100. Pollution peaks around 11:00 PM (O3: 34.8/100).
When is air pollution at its worst in Mariposa?
Conditions in Mariposa vary noticeably across the seasons: winter rains provide the only real relief from an otherwise persistent haze, but summer sunshine and heat drive some of the worst ozone readings in the country. Coastal breezes offer some relief compared to inland valley locations that see heavier smog buildup.
Are air quality levels in Mariposa 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: 10 August 2026 at 02:34 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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