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)
137
Unhealthy for sensitive groups
Caldwell, Idaho
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
49.72 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
59.44 μg/m³
0
55
155
255
425
605+
42.45 ppb
0
55
71
86
201
201+
1.71 ppb
0
36
76
186
605
1005+
2.26 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 139
Unhealthy for sensitive groups
51.31μg/m³
PM2.5
155.39μg/m³
PM10
44.98ppb
O3
1.55ppb
SO2
2.25ppb
NO2
0.18ppm
CO
AQI 86
Moderate
27.54μg/m³
PM2.5
64.03μg/m³
PM10
44.22ppb
O3
0.51ppb
SO2
1.62ppb
NO2
0.18ppm
CO
AQI 124
Unhealthy for sensitive groups
44.77μg/m³
PM2.5
171.02μg/m³
PM10
44.76ppb
O3
1.32ppb
SO2
1.60ppb
NO2
0.18ppm
CO
AQI 92
Moderate
24.96μg/m³
PM2.5
136.88μg/m³
PM10
44.09ppb
O3
0.48ppb
SO2
1.60ppb
NO2
0.18ppm
CO
AQI 77
Moderate
23.14μg/m³
PM2.5
97.62μg/m³
PM10
41.90ppb
O3
0.48ppb
SO2
1.60ppb
NO2
0.18ppm
CO
AQI 96
Moderate
32.77μg/m³
PM2.5
114.31μg/m³
PM10
44.23ppb
O3
0.48ppb
SO2
1.60ppb
NO2
0.18ppm
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 01:00:00 on 2026-07-23.
In the last 24 hrs, the best air quality in Caldwell, Idaho was observed at 03:00:00 on 2026-07-23.
The current air quality in Caldwell, Idaho is 137, categorized as Unhealthy for Sensitive Groups based on real-time data.
The most common pollutant in Caldwell, Idaho is PM2.5.
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 49.722 μg/m3.
The current PM10 concentration at Caldwell, Idaho is 59.441 μg/m3.
The current carbon monoxide (CO) concentration at Caldwell, Idaho is 0.183 ppm.
The current sulfur dioxide (SO2) concentration at Caldwell, Idaho is 1.705 ppb.
The current ozone (O3) concentration at Caldwell, Idaho is 42.451 ppm.
The current nitrogen dioxide (NO2) concentration at Caldwell, Idaho is 2.263 ppb.
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