Air Quality in National City, United States

Cloudy
17.4°C · 75.0% humidity
17.4°
Feels 17.4°
29
Good
Air quality is satisfactory. Enjoy outdoor activities.
5 stations

Nearby Monitoring Stations

AQI Forecast
54 4am
54
54
29 7am
30
31
32 10am
33
33
33 1pm
34
34
34 4pm
34
27
27 7pm
27
27
27 10pm
27
27
34 1am
34
54
AD 728×90

Air Quality Index Trend

48h · 1 stn

National City's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in National City is 1.4× the WHO annual guideline of 5 µg/m³.

75.0%
Humidity
22.4 km/h
Wind SW
1011.4 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
29
7.0 µg/m³
PM10
25
27.4 µg/m³
050100150200300500

What is the weather forecast for National City?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station
PM2.57.0 µg/m³ ✓ WHO
Good
PM1027.4 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
Station readings (5 stations within 25 km)
7.0
Median
5.1
Average
3.69
Low
8.4
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +0.3

What is the 7-day forecast for National City?

05-29
22.0° 17.4°
05-30
17.8° 16.4°
05-31
20.5° 18.7°
06-01
21.0° 17.5°
06-02
21.3° 16.2°
06-03
20.7° 15.6°
06-04
19.8° 17.1°
Both models agree Avg diff: 1.6°C

Where are air quality stations near National City?

5
San Diego - Sherman Elementary School, San Diego, California
5.4 km PM2.5: 1.2 µg/m³
21
San Diego - Sherman Elementary School, San Diego, California
5.4 km PM2.5: 5.0 µg/m³
25
San Diego - Sherman Elementary School, San Diego, California
5.4 km PM2.5: 6.0 µg/m³
18
Smythe Avenue
13.5 km PM2.5: 4.4 µg/m³
15
Ocean View Hills
13.8 km PM2.5: 3.7 µg/m³
18
International Border
16.1 km PM2.5: 4.4 µg/m³
17
Otay Mesa - Donovan Correctional Facility, San Diego, California
19.3 km PM2.5: 4.1 µg/m³
17
Otay Mesa - Donovan Correctional Facility, San Diego, California
19.3 km PM2.5: 4.1 µg/m³
34
Otay Mesa - Donovan Correctional Facility, San Diego, California
19.3 km PM2.5: 8.2 µg/m³
26
Otay Mesa - Donovan Correctional Facility, San Diego, California
19.3 km PM2.5: 6.2 µg/m³

What cities are near National City?

22 Chula Vista 34 San Diego 32 Coronado 25 Lemon Grove 23 La Presa 19 Imperial Beach 24 Spring Valley 24 La Mesa 24 Casa de Oro-Mount Helix 23 Rancho San Diego
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T14:29 UTC.