Worst air pollution Smithtown, today and tomorrow
Today (16 July): Air quality in Smithtown is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 37.6/100).
Tomorrow (17 July 2026): Air quality in Smithtown is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 40.4/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Smithtown's air quality in Long Island benefits from Long Island Sound coastal proximity, with consistent maritime breezes providing reliable ventilation along this Suffolk County suburban shoreline. Vehicle emissions from the Long Island Expressway and Route 25 are the primary local sources, while prevailing westerlies carry the broader New York City metropolitan area's pollution plume eastward across Long Island throughout the year.
Today - 16 July | Pollution peaks at 12:00
AQI:
Fair
37.6/100
PM2.5 (fine particles):
Good
9.6/100
PM10 (coarse particles):
Good
9.7/100
NO2 (nitrogen dioxide):
Good
2.6/100
O3 (ozone):
Fair
37.6/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.1/100
PM1 (ultrafine particles):
Good
5.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Medium
40.4/100
PM2.5 (fine particles):
Good
6.5/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
4.5/100
O3 (ozone):
Medium
40.4/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
4.1/100
Pollen forecast in Smithtown
View pollen forecastFrequently Asked Questions
Is air quality bad in Smithtown right now?
On 16 July 2026, overall air quality in Smithtown is fair. AQI is the main air quality indicator at 37.6/100. Pollution peaks around 12:00 PM (O3: 37.6/100).
Will air quality be worse tomorrow in Smithtown?
On 17 July 2026, air quality conditions in Smithtown will be better than today, with AQI forecast at medium at 40.4/100. Pollution peaks around 12:00 PM (O3: 40.4/100).
When is air pollution at its worst in Smithtown?
Smithtown follows a fairly predictable seasonal air quality pattern. Typically, frequent frontal systems in spring and fall usually keep the air cleanest then, while summer heat and regional haze drifting up from the Midwest and South drive ozone spikes. Coastal sea breezes can offer some relief from inland summer ozone buildup.
Are air quality levels in Smithtown 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