Stay updated with real-time air quality in National City, 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)
37
Good
National City, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
3.48 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
11.85 μg/m³
0
55
155
255
425
605+
39.56 ppb
0
55
71
86
201
201+
0.43 ppb
0
36
76
186
605
1005+
4.30 ppb
0
54
101
361
1250
2050+
0.29 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
National City, California
National City, California
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AQI 36
Good
3.19μg/m³
PM2.5
9.93μg/m³
PM10
38.58ppb
O3
0.42ppb
SO2
3.06ppb
NO2
0.29ppm
CO
AQI 36
Good
3.21μg/m³
PM2.5
10.33μg/m³
PM10
39.14ppb
O3
0.42ppb
SO2
3.01ppb
NO2
0.29ppm
CO
AQI 38
Good
3.77μg/m³
PM2.5
13.77μg/m³
PM10
40.84ppb
O3
0.44ppb
SO2
5.54ppb
NO2
0.29ppm
CO
AQI 37
Good
3.67μg/m³
PM2.5
13.14μg/m³
PM10
40.38ppb
O3
0.43ppb
SO2
5.16ppb
NO2
0.29ppm
CO
AQI 36
Good
3.27μg/m³
PM2.5
10.01μg/m³
PM10
38.72ppb
O3
0.43ppb
SO2
3.71ppb
NO2
0.29ppm
CO
AQI 37
Good
3.45μg/m³
PM2.5
12.93μg/m³
PM10
39.89ppb
O3
0.42ppb
SO2
3.25ppb
NO2
0.29ppm
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 National City, California is updated every hour for accuracy.
In the past 24 hours, the air quality in National City, California was at its worst at 09:00:00 on 2026-04-21.
In the last 24 hours, the best air quality in National City, California was observed at 01:00:00 on 2026-04-22.
As of now, the AQI in National City, California is 37, indicating Good conditions.
National City, California air has the highest levels of O3.
Poor air quality in National City, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in National City, California are currently 3.476 μg/m3.
The PM10 concentration in National City, California is 11.851 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in National City, California is 0.288 ppm.
Currently, National City, California has a sulfur dioxide (SO2) concentration of 0.431 ppb.
The current ozone (O3) level in National City, California at the moment is 39.558 ppm.
Nitrogen dioxide (NO2) level in National City, California at the moment is 4.297 ppb.
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