San Diego air quality now

United States · The summary is refreshed every 15 minutes.

November 11

The air is clean now

San Diego

28°C

Clear

5AQI

1017

hPa

Atmospheric
pressure

29%

Humidity

San Diego, November 10, 2026: daily mean PM2.5 4 µg/m³ (4 sensors), level “Low” — as in the Atmy Data Hub. Now (14:00 local time): 0.9 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in San Diego, PM2.5 averages 0.9 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors from AirGradient, Sensor.Community, readings from 13:47–13:56 local time (21:47–21:56 UTC), summary prepared at 14:00 local time. Median: 0.9 µg/m³; range across sensors: 0.0–2.0 µg/m³.

In San Diego the air is good 🟢 AQI 5. About the same as three hours ago. ☀️ +28 °C · No precipitation · Wind 2 m/s

In San Diego the air is good right now (approximate, US EPA scale). From 01:00 to 14:00 local time the city mean PM2.5 fell from 4.5 to 0.9 µg/m³.

The weather data do not point to a clear reason for this level.

Weather now: clear, 28°C, wind 2 m/s, humidity 29%. By 14:00 the wind is expected to pick up to 4 m/s, which may clear the air. By 01:00 the temperature will be about 16°C.

Written automatically at 14:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

2 m/s

Wind, NW

0 mm

Precipitation today

San Diego: air quality for the completed day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · November 10, 2026 · 00:00–24:00 UTC = 16:00–16:00 UTC-8

4 µg/m³ Low

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 16:00–16:00 UTC-8): 4 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.

LowModerateElevatedHighVery highExtremely high

Pollution accumulation index now

5/100Low · An estimate of weather conditions · not a PM2.5 forecast

Now56
14.0022.0005.0013.00

Pollution accumulation forecast

Today — November 11

28°/13°

Index by time of day

50/100Moderate

  1. 50/100Night
  2. 39/100Morning
  3. 10/100Day
  4. 25/100Evening

Thursday — November 12

24°/14°

Index by time of day

58/100Moderate

  1. 58/100Night
  2. 43/100Morning
  3. 10/100Day
  4. 26/100Evening

Friday — November 13

22°/15°

Index by time of day

43/100Moderate

  1. 43/100Night
  2. 37/100Morning
  3. 8/100Day
  4. 22/100Evening

Saturday — November 14

20°/18°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 24/100Morning
  3. 8/100Day
  4. 23/100Evening

Sunday — November 15

22°/18°

Index by time of day

51/100Moderate

  1. 51/100Night
  2. 43/100Morning
  3. 9/100Day
  4. 27/100Evening

Monday — November 16

22°/17°

Index by time of day

58/100Moderate

  1. 58/100Night
  2. 44/100Morning
  3. 8/100Day
  4. 20/100Evening

Forecast of conditions that trap pollution near the surface

Weather

28°

Clear. Feels like 27°C

  1. MorningClear23°C35%
  2. DayClear26°C41%
  3. EveningClear17°C81%

Wind

2m/sWind from the NW

3m/sWind gusts

Wind force: 2

Gusts up to 5 m/s are expected.

10-day weather forecast for San Diego

United States

  1. TodayNov 11Fog28°C13°C
  2. ThuNov 12Cloudy24°C14°C
  3. FriNov 13Rain22°C15°C
  4. SatNov 14Rain20°C18°C
  5. SunNov 15Cloudy22°C18°C
  6. MonNov 16Partly cloudy22°C17°C
  7. TueNov 17Rain20°C17°C
  8. WedNov 18Rain20°C18°C
  9. ThuNov 19Cloudy20°C16°C
  10. FriNov 20Cloudy19°C16°C

Where in San Diego is the air worse?

See all sensors

Highest current reading: 2.0 µg/m³ (Torrey Highlands). Lowest: 0.0 µg/m³ (San Diego - Bay Ho). The list shows every sensor, highest first.

  1. Torrey Highlands →2 µg/m³
  2. Tierrasanta, San Diego →2 µg/m³
  3. SC #45700 →0 µg/m³
  4. San Diego - Bay Ho →0 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: AirGradient — 3 sensors, Sensor.Community — 1 sensor.

Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.

United States: sensors in total

35

  1. PortlandUnited States

    4

  2. BellevueUnited States

    3

  3. FrederickUnited States

    2

Cities with the most sensors

All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.

Air quality calendar: San Diego

Daily mean PM2.5 of the city sensors, µg/m³

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

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Air quality in San Diego now — Atmy

United States · City ranking · All pilot cities

Questions

What was the air quality in San Diego over the last completed day?

Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 16:00–16:00 UTC-8): 4 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.

What is the air quality in San Diego right now?

Right now in San Diego, PM2.5 averages 0.9 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors from AirGradient, Sensor.Community, readings from 13:47–13:56 local time (21:47–21:56 UTC), summary prepared at 14:00 local time. Median: 0.9 µg/m³; range across sensors: 0.0–2.0 µg/m³.

Is it safe to be outdoors in San Diego now?

The current level is “good” (US EPA scale, approximate). Air quality is satisfactory; no restrictions are recommended. This is the standard guidance of the scale, not medical advice.

Where in San Diego is the air worse?

Highest current reading: 2.0 µg/m³ (Torrey Highlands). Lowest: 0.0 µg/m³ (San Diego - Bay Ho). The list shows every sensor, highest first.

Where do these data come from?

From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.

How often is this page updated?

The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.

Data

Where do these data come from?

The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.

“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.

Source: public Atmy monitoring data. Methodology and data sources · Data terms