Stay updated with real-time air quality in Caldwell, Idaho 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)
40
Good
Caldwell, Idaho
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.13 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
43.20 μg/m³
0
55
155
255
425
605+
24.11 ppb
0
55
71
86
201
201+
0.38 ppb
0
36
76
186
605
1005+
4.39 ppb
0
54
101
361
1250
2050+
0.18 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Caldwell, Idaho
Caldwell, Idaho
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AQI 44
Good
8.08μg/m³
PM2.5
44.36μg/m³
PM10
22.73ppb
O3
0.34ppb
SO2
5.51ppb
NO2
0.19ppm
CO
AQI 47
Good
4.77μg/m³
PM2.5
50.76μg/m³
PM10
22.02ppb
O3
0.34ppb
SO2
5.45ppb
NO2
0.19ppm
CO
AQI 44
Good
8.14μg/m³
PM2.5
36.97μg/m³
PM10
22.28ppb
O3
0.33ppb
SO2
5.50ppb
NO2
0.19ppm
CO
AQI 51
Moderate
6.25μg/m³
PM2.5
54.57μg/m³
PM10
20.80ppb
O3
0.32ppb
SO2
5.00ppb
NO2
0.20ppm
CO
AQI 52
Moderate
6.56μg/m³
PM2.5
57.81μg/m³
PM10
20.26ppb
O3
0.31ppb
SO2
4.94ppb
NO2
0.20ppm
CO
AQI 44
Good
5.29μg/m³
PM2.5
48.32μg/m³
PM10
22.03ppb
O3
0.35ppb
SO2
4.96ppb
NO2
0.19ppm
CO
Air quality data and pollutant measurements for Idaho, 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 Caldwell, Idaho is updated every hour.
The worst air quality in Caldwell, Idaho in the last 24 hours was observed at 12:00:00 on 2026-10-22.
In the last 24 hrs, the best air quality in Caldwell, Idaho was observed at 09:00:00 on 2026-10-21.
The current air quality in Caldwell, Idaho is 40, categorized as Good based on real-time data.
The most common pollutant in Caldwell, Idaho is PM10.
If the air quality in Caldwell, Idaho is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at Caldwell, Idaho is 5.135 μg/m3.
The current PM10 concentration at Caldwell, Idaho is 43.195 μg/m3.
The current carbon monoxide (CO) concentration at Caldwell, Idaho is 0.185 ppm.
The current sulfur dioxide (SO2) concentration at Caldwell, Idaho is 0.383 ppb.
The current ozone (O3) concentration at Caldwell, Idaho is 24.111 ppm.
The current nitrogen dioxide (NO2) concentration at Caldwell, Idaho is 4.389 ppb.
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