Stay updated with real-time air quality in Downey, California 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)
67
Moderate
Downey, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
18.26 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
80.77 μg/m³
0
55
155
255
425
605+
6.22 ppb
0
55
71
86
201
201+
0.35 ppb
0
36
76
186
605
1005+
25.97 ppb
0
54
101
361
1250
2050+
0.62 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
Downey, California
Downey, California
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AQI 56
Moderate
11.83μg/m³
PM2.5
52.96μg/m³
PM10
18.57ppb
O3
0.33ppb
SO2
20.77ppb
NO2
0.34ppm
CO
AQI 66
Moderate
17.20μg/m³
PM2.5
74.83μg/m³
PM10
10.30ppb
O3
0.33ppb
SO2
24.53ppb
NO2
0.45ppm
CO
AQI 38
Good
6.68μg/m³
PM2.5
29.54μg/m³
PM10
26.04ppb
O3
0.32ppb
SO2
16.77ppb
NO2
0.24ppm
CO
AQI 69
Moderate
19.02μg/m³
PM2.5
83.41μg/m³
PM10
7.89ppb
O3
0.34ppb
SO2
26.80ppb
NO2
0.48ppm
CO
AQI 33
Good
6.47μg/m³
PM2.5
28.46μg/m³
PM10
25.76ppb
O3
0.35ppb
SO2
19.23ppb
NO2
0.27ppm
CO
AQI 44
Good
8.36μg/m³
PM2.5
35.83μg/m³
PM10
8.76ppb
O3
0.25ppb
SO2
28.05ppb
NO2
0.47ppm
CO
Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for Downey, California is updated every hour for accuracy.
In the past 24 hours, the air quality in Downey, California was at its worst at 07:00:00 on 2026-01-22.
In the last 24 hours, the best air quality in Downey, California was observed at 05:00:00 on 2026-01-23.
As of now, the AQI in Downey, California is 56, indicating Moderate conditions.
Downey, California air has the highest levels of PM2.5.
Poor air quality in Downey, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in Downey, California are currently 11.54 μg/m3.
The PM10 concentration in Downey, California is 51.685 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Downey, California is 0.333 ppm.
Currently, Downey, California has a sulfur dioxide (SO2) concentration of 0.335 ppb.
The current ozone (O3) level in Downey, California at the moment is 18.906 ppm.
Nitrogen dioxide (NO2) level in Downey, California at the moment is 20.893 ppb.
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