Worst air pollution Westfield, today and tomorrow
Today (16 July): Air quality in Westfield is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 8:00 AM (O3: 34.1/100).
Tomorrow (17 July 2026): Air quality in Westfield is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 8:00 AM (O3: 38.0/100). 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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Westfield's air quality benefits from the flat Hamilton County Indiana prairie providing generally good wind dispersal, with vehicle emissions from US-31 the primary local source in this rapidly growing Indianapolis northern suburb. The broader Indianapolis metropolitan regional ozone from vehicle and agricultural sources is the primary warm-season concern, while the flat terrain and consistent Midwest winds generally maintain moderate conditions throughout the year.
Today - 16 July | Pollution peaks at 08:00
AQI:
Fair
34.1/100
PM2.5 (fine particles):
Good
13.1/100
PM10 (coarse particles):
Good
11.9/100
NO2 (nitrogen dioxide):
Fair
23.8/100
O3 (ozone):
Fair
34.1/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Good
8.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 08:00
AQI:
Fair
38.0/100
PM2.5 (fine particles):
Good
14.2/100
PM10 (coarse particles):
Good
8.2/100
NO2 (nitrogen dioxide):
Good
18.6/100
O3 (ozone):
Fair
38.0/100
SO2 (sulfur dioxide):
Good
2.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.6/100
PM1 (ultrafine particles):
Good
9.1/100
Pollen forecast in Westfield
View pollen forecastFrequently Asked Questions
Is air quality bad in Westfield right now?
On 16 July 2026, overall air quality in Westfield is fair. AQI is the main air quality indicator at 34.1/100. Pollution peaks around 8:00 AM (O3: 34.1/100).
Will air quality be worse tomorrow in Westfield?
On 17 July 2026, air quality conditions in Westfield will be similar to today, with AQI forecast at fair at 38.0/100. Pollution peaks around 8:00 AM (O3: 38.0/100).
When is air pollution at its worst in Westfield?
Westfield sees air quality change through the year, as spring and autumn tend to bring the cleanest, most stable air; by contrast, prolonged summer heat waves are when air quality most often dips into unhealthy territory. Lake-effect winds can help clear the air on many days near the Great Lakes shoreline.
Are air quality levels in Westfield 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