Worst air pollution Ninth Square - New Haven, today and tomorrow
Today (13 July): Air quality in Ninth Square is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (O3: 36.9/100).
Tomorrow (14 July 2026): Air quality in Ninth Square is fair. All pollutants stay as today. Pollution peaks around 8:00 AM (O3: 36.6/100). 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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New Haven's Ninth Square air quality reflects the downtown mixed-use arts district, with vehicle traffic on the surrounding Chapel Street and Orange Street corridors contributing local sources. The Long Island Sound coastal influence provides background maritime ventilation, while the neighbourhood's walkable character generally maintains moderate New Haven downtown readings throughout most of the year.
Today - 13 July | Pollution peaks at 11:00
AQI:
Fair
36.9/100
PM2.5 (fine particles):
Good
16.1/100
PM10 (coarse particles):
Good
13.6/100
NO2 (nitrogen dioxide):
Good
13.1/100
O3 (ozone):
Fair
36.9/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
10.3/100
Levels show the poorest local air quality during the day
Tomorrow - 14 July | Pollution peaks at 08:00
AQI:
Fair
36.6/100
PM2.5 (fine particles):
Good
14.3/100
PM10 (coarse particles):
Good
9.4/100
NO2 (nitrogen dioxide):
Good
15.1/100
O3 (ozone):
Fair
36.6/100
SO2 (sulfur dioxide):
Good
2.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.9/100
PM1 (ultrafine particles):
Good
9.8/100
Other Landmarks in New Haven
Sports venues in New Haven
Frequently Asked Questions
Is air quality bad in Ninth Square right now?
On 13 July 2026, overall air quality in Ninth Square is fair. AQI is the main air quality indicator at 36.9/100. Pollution peaks around 11:00 AM (O3: 36.9/100).
Will air quality be worse tomorrow in Ninth Square?
On 14 July 2026, air quality conditions in Ninth Square will be similar to today, with AQI forecast at fair at 36.6/100. Pollution peaks around 8:00 AM (O3: 36.6/100).
When is air pollution at its worst in Ninth Square?
Conditions at Ninth Square vary noticeably across the seasons. In short, the cleanest conditions typically arrive with the more unsettled weather of spring and autumn, whereas summer heat waves, often worsened by haze drifting in from other regions, bring the year's worst air. Winter cold fronts tend to clear the air quickly, so extended pollution episodes are relatively uncommon.
Are air quality levels in Ninth Square 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: 13 July 2026 at 21:48 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