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)
78
Moderate
Smithtown, New York
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
20.33 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
109.57 μg/m³
0
55
155
255
425
605+
16.77 ppb
0
55
71
86
201
201+
0.51 ppb
0
36
76
186
605
1005+
24.73 ppb
0
54
101
361
1250
2050+
0.40 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
Smithtown, New York
Smithtown, New York
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AQI 77
Moderate
23.15μg/m³
PM2.5
102.57μg/m³
PM10
18.89ppb
O3
0.50ppb
SO2
23.21ppb
NO2
0.40ppm
CO
AQI 63
Moderate
14.99μg/m³
PM2.5
80.34μg/m³
PM10
18.21ppb
O3
0.52ppb
SO2
23.25ppb
NO2
0.40ppm
CO
AQI 81
Moderate
25.02μg/m³
PM2.5
108.26μg/m³
PM10
17.32ppb
O3
0.50ppb
SO2
24.24ppb
NO2
0.40ppm
CO
AQI 58
Moderate
12.91μg/m³
PM2.5
57.30μg/m³
PM10
19.51ppb
O3
0.52ppb
SO2
26.48ppb
NO2
0.41ppm
CO
AQI 79
Moderate
24.35μg/m³
PM2.5
88.31μg/m³
PM10
18.56ppb
O3
0.59ppb
SO2
24.56ppb
NO2
0.42ppm
CO
AQI 81
Moderate
25.12μg/m³
PM2.5
89.71μg/m³
PM10
18.32ppb
O3
0.61ppb
SO2
24.48ppb
NO2
0.42ppm
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 2026-02-04.
In the last 24 hrs, the best air quality in Smithtown, New York was observed at 04:00:00 on 2026-02-03.
The current air quality in Smithtown, New York is 78, categorized as Moderate based on real-time data.
The most common pollutant in Smithtown, New York is PM10.
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 20.326 μg/m3.
The current PM10 concentration at Smithtown, New York is 109.571 μg/m3.
The current carbon monoxide (CO) concentration at Smithtown, New York is 0.396 ppm.
The current sulfur dioxide (SO2) concentration at Smithtown, New York is 0.509 ppb.
The current ozone (O3) concentration at Smithtown, New York is 16.774 ppm.
The current nitrogen dioxide (NO2) concentration at Smithtown, New York is 24.735 ppb.
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