Stay updated with real-time air quality in Smithtown, New York featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
39
Good
Smithtown, New York
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
15.07 μg/m³
0
55
155
255
425
605+
41.58 ppb
0
55
71
86
201
201+
0.11 ppb
0
36
76
186
605
1005+
2.24 ppb
0
54
101
361
1250
2050+
0.22 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Smithtown, New York
Smithtown, New York
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AQI 33
Good
4.12μg/m³
PM2.5
16.98μg/m³
PM10
36.08ppb
O3
0.11ppb
SO2
2.32ppb
NO2
0.20ppm
CO
AQI 31
Good
3.47μg/m³
PM2.5
17.89μg/m³
PM10
33.74ppb
O3
0.11ppb
SO2
2.68ppb
NO2
0.22ppm
CO
AQI 33
Good
4.03μg/m³
PM2.5
16.88μg/m³
PM10
35.59ppb
O3
0.11ppb
SO2
2.62ppb
NO2
0.20ppm
CO
AQI 40
Good
5.42μg/m³
PM2.5
22.53μg/m³
PM10
42.62ppb
O3
0.11ppb
SO2
3.24ppb
NO2
0.22ppm
CO
AQI 33
Good
4.97μg/m³
PM2.5
20.47μg/m³
PM10
35.69ppb
O3
0.12ppb
SO2
3.49ppb
NO2
0.22ppm
CO
AQI 32
Good
5.11μg/m³
PM2.5
21.15μg/m³
PM10
35.33ppb
O3
0.12ppb
SO2
3.70ppb
NO2
0.23ppm
CO
Air quality data and pollutant measurements for New York, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for Smithtown, New York is updated every hour.
The worst air quality in Smithtown, New York in the last 24 hours was observed at 08:00:00 on 2026-08-04.
In the last 24 hrs, the best air quality in Smithtown, New York was observed at 08:00:00 on 2026-08-04.
The current air quality in Smithtown, New York is 39, categorized as Good based on real-time data.
The most common pollutant in Smithtown, New York is O3.
If the air quality in Smithtown, New York is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Smithtown, New York is 4.388 μg/m3.
The current PM10 concentration at Smithtown, New York is 15.07 μg/m3.
The current carbon monoxide (CO) concentration at Smithtown, New York is 0.218 ppm.
The current sulfur dioxide (SO2) concentration at Smithtown, New York is 0.107 ppb.
The current ozone (O3) concentration at Smithtown, New York is 41.58 ppm.
The current nitrogen dioxide (NO2) concentration at Smithtown, New York is 2.242 ppb.
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