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)
52
Moderate
Smithtown, New York
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
10.04 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
46.23 μg/m³
0
55
155
255
425
605+
48.37 ppb
0
55
71
86
201
201+
0.34 ppb
0
36
76
186
605
1005+
6.72 ppb
0
54
101
361
1250
2050+
0.25 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
Smithtown, New York
Smithtown, New York
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AQI 49
Good
9.15μg/m³
PM2.5
39.42μg/m³
PM10
49.80ppb
O3
0.33ppb
SO2
6.53ppb
NO2
0.23ppm
CO
AQI 52
Moderate
9.66μg/m³
PM2.5
38.89μg/m³
PM10
49.51ppb
O3
0.35ppb
SO2
7.55ppb
NO2
0.26ppm
CO
AQI 49
Good
9.00μg/m³
PM2.5
38.48μg/m³
PM10
49.59ppb
O3
0.33ppb
SO2
7.65ppb
NO2
0.23ppm
CO
AQI 52
Moderate
10.47μg/m³
PM2.5
44.45μg/m³
PM10
46.37ppb
O3
0.43ppb
SO2
7.08ppb
NO2
0.26ppm
CO
AQI 49
Good
9.46μg/m³
PM2.5
26.23μg/m³
PM10
45.70ppb
O3
0.45ppb
SO2
7.80ppb
NO2
0.26ppm
CO
AQI 49
Good
9.49μg/m³
PM2.5
24.10μg/m³
PM10
45.26ppb
O3
0.47ppb
SO2
8.17ppb
NO2
0.27ppm
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 02:00:00 on 2026-05-06.
In the last 24 hrs, the best air quality in Smithtown, New York was observed at 09:00:00 on 2026-05-06.
The current air quality in Smithtown, New York is 52, categorized as Moderate based on real-time data.
The most common pollutant in Smithtown, New York is PM2.5.
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 10.035 μg/m3.
The current PM10 concentration at Smithtown, New York is 46.225 μg/m3.
The current carbon monoxide (CO) concentration at Smithtown, New York is 0.253 ppm.
The current sulfur dioxide (SO2) concentration at Smithtown, New York is 0.343 ppb.
The current ozone (O3) concentration at Smithtown, New York is 48.372 ppm.
The current nitrogen dioxide (NO2) concentration at Smithtown, New York is 6.723 ppb.
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