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)
49
Good
National City, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
8.97 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.69 μg/m³
0
55
155
255
425
605+
35.96 ppb
0
55
71
86
201
201+
0.48 ppb
0
36
76
186
605
1005+
10.30 ppb
0
54
101
361
1250
2050+
0.17 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
National City, California
National City, California
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AQI 44
Good
8.44μg/m³
PM2.5
37.01μg/m³
PM10
32.76ppb
O3
0.44ppb
SO2
3.06ppb
NO2
0.11ppm
CO
AQI 49
Good
8.68μg/m³
PM2.5
38.01μg/m³
PM10
32.47ppb
O3
0.46ppb
SO2
3.09ppb
NO2
0.11ppm
CO
AQI 44
Good
8.40μg/m³
PM2.5
36.97μg/m³
PM10
31.40ppb
O3
0.40ppb
SO2
3.34ppb
NO2
0.10ppm
CO
AQI 44
Good
8.22μg/m³
PM2.5
35.94μg/m³
PM10
31.57ppb
O3
0.40ppb
SO2
3.31ppb
NO2
0.10ppm
CO
AQI 49
Good
8.92μg/m³
PM2.5
39.37μg/m³
PM10
31.69ppb
O3
0.44ppb
SO2
3.07ppb
NO2
0.11ppm
CO
AQI 44
Good
7.92μg/m³
PM2.5
34.41μg/m³
PM10
33.11ppb
O3
0.44ppb
SO2
3.00ppb
NO2
0.11ppm
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 03:00:00 on 2026-06-09.
In the last 24 hours, the best air quality in National City, California was observed at 07:00:00 on 2026-06-08.
As of now, the AQI in National City, California is 49, indicating Good conditions.
National City, California air has the highest levels of PM2.5.
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 8.577 μg/m3.
The PM10 concentration in National City, California is 37.012 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in National City, California is 0.107 ppm.
Currently, National City, California has a sulfur dioxide (SO2) concentration of 0.429 ppb.
The current ozone (O3) level in National City, California at the moment is 32.16 ppm.
Nitrogen dioxide (NO2) level in National City, California at the moment is 3.12 ppb.
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