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)
23
Good
Downey, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
4.39 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
18.96 μg/m³
0
55
155
255
425
605+
25.20 ppb
0
55
71
86
201
201+
0.68 ppb
0
36
76
186
605
1005+
12.74 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Very high
Downey, California
Downey, California
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AQI 23
Good
4.35μg/m³
PM2.5
18.90μg/m³
PM10
25.02ppb
O3
0.68ppb
SO2
12.76ppb
NO2
0.23ppm
CO
AQI 22
Good
3.55μg/m³
PM2.5
15.89μg/m³
PM10
23.27ppb
O3
0.74ppb
SO2
12.77ppb
NO2
0.25ppm
CO
AQI 27
Good
5.07μg/m³
PM2.5
21.56μg/m³
PM10
26.32ppb
O3
0.65ppb
SO2
12.42ppb
NO2
0.21ppm
CO
AQI 20
Good
3.34μg/m³
PM2.5
15.00μg/m³
PM10
22.48ppb
O3
0.75ppb
SO2
13.37ppb
NO2
0.26ppm
CO
AQI 27
Good
5.12μg/m³
PM2.5
21.04μg/m³
PM10
27.09ppb
O3
0.61ppb
SO2
12.16ppb
NO2
0.21ppm
CO
AQI 28
Good
5.14μg/m³
PM2.5
18.99μg/m³
PM10
30.31ppb
O3
0.73ppb
SO2
11.41ppb
NO2
0.26ppm
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 12:00:00 on 2026-04-24.
In the last 24 hours, the best air quality in Downey, California was observed at 08:00:00 on 2026-04-24.
As of now, the AQI in Downey, California is 23, indicating Good conditions.
Downey, California air has the highest levels of O3.
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 4.395 μg/m3.
The PM10 concentration in Downey, California is 18.965 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in Downey, California is 0.227 ppm.
Currently, Downey, California has a sulfur dioxide (SO2) concentration of 0.679 ppb.
The current ozone (O3) level in Downey, California at the moment is 25.201 ppm.
Nitrogen dioxide (NO2) level in Downey, California at the moment is 12.739 ppb.
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