Worst air pollution Smithtown, today and tomorrow
Today (9 August): 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 11:00 AM (O3: 38.1/100).
Tomorrow (10 August 2026): Air quality in Smithtown is fair. PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (O3: 36.1/100). 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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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 - 9 August | Pollution peaks at 11:00
AQI:
Fair
38.1/100
PM2.5 (fine particles):
Good
12.7/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Good
4.7/100
O3 (ozone):
Fair
38.1/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.9/100
PM1 (ultrafine particles):
Good
17.0/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 11:00
AQI:
Fair
36.1/100
PM2.5 (fine particles):
Good
16.6/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Good
5.2/100
O3 (ozone):
Fair
36.1/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.3/100
PM1 (ultrafine particles):
Fair
20.9/100
Pollen forecast in Smithtown
View pollen forecastFrequently Asked Questions
Is air quality bad in Smithtown right now?
On 9 August 2026, overall air quality in Smithtown is fair. AQI is the main air quality indicator at 38.1/100. Pollution peaks around 11:00 AM (O3: 38.1/100).
Will air quality be worse tomorrow in Smithtown?
On 10 August 2026, air quality conditions in Smithtown will be similar to today, with AQI forecast at fair at 36.1/100. Pollution peaks around 11:00 AM (O3: 36.1/100).
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.
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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