Pasadena air quality now

United States · The summary is refreshed every 15 minutes.

October 22

The air is clean now

Pasadena

16°C

Clear

2AQI

1015hPa

Atmospheric
pressure

75%

Humidity

Pasadena, October 21, 2026: daily mean PM2.5 3 µg/m³ (5 sensors), level “Low” — as in the Atmy Data Hub. Now (11:00 local time): 0.4 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Pasadena, PM2.5 averages 0.4 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors on the Atmy network, readings from 10:47–10:47 local time (17:47–17:47 UTC), summary prepared at 11:00 local time. Median: 0.0 µg/m³; range across sensors: 0.0–2.0 µg/m³.

In Pasadena the air is good right now (approximate, US EPA scale). From 22:00 to 11:00 local time the city mean PM2.5 stayed roughly level: from 0.4 to 0.4 µg/m³.

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

Weather now: clear, 16°C, wind 2 m/s, humidity 75%. By 11:00 the wind is expected to pick up to 4 m/s, which may clear the air.

Written automatically at 11:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

7 km/h

Wind, SE

0 mm

Precipitation today

Pasadena: air quality for the completed day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · October 21, 2026 · 00:00–24:00 UTC

3 µg/m³ Low

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub.

LowModerateElevatedHighVery highExtremely high

Air Quality in United States for the Completed Day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · October 21, 2026 · 00:00–24:00 UTC

Portland →9 µg/m³Bellevue →9 µg/m³
LowModerateElevatedHighVery highExtremely high

Source: Air monitoring system atmy.ai

Pasadena: PM2.5 by month

Metric: PM2.5, µg/m³ · Color scale: EPA AQI

Mean
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
This month
12
-
-
-
-
-
-
-
-
-
12
11
-
-

Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.

Pollution accumulation index now

20%An estimate of weather conditions · not a PM2.5 forecast

Now2036
11.0019.0002.0010.00

Pollution accumulation forecast

Today — October 22

19°/14°

Index by time of day

45/100Moderate

  1. 45/100Night
  2. 36/100Morning
  3. 8/100Day
  4. 27/100Evening

Friday — October 23

21°/12°

Index by time of day

59/100Moderate

  1. 59/100Night
  2. 45/100Morning
  3. 9/100Day
  4. 27/100Evening

Saturday — October 24

24°/13°

Index by time of day

54/100Moderate

  1. 54/100Night
  2. 38/100Morning
  3. 7/100Day
  4. 21/100Evening

Sunday — October 25

27°/19°

Index by time of day

52/100Moderate

  1. 52/100Night
  2. 38/100Morning
  3. 6/100Day
  4. 20/100Evening

Monday — October 26

28°/20°

Index by time of day

47/100Moderate

  1. 47/100Night
  2. 37/100Morning
  3. 7/100Day
  4. 20/100Evening

Tuesday — October 27

27°/21°

Index by time of day

44/100Moderate

  1. 44/100Night
  2. 32/100Morning
  3. 5/100Day
  4. 21/100Evening

Forecast of conditions that trap pollution near the surface

Weather

16°

Clear. Feels like 16°C

  1. MorningClear16°C75%
  2. DayPartly cloudy18°C67%
  3. EveningClear14°C75%

Wind

7km/hWind from the SE

14km/hWind gusts

Wind force: 2

Gusts up to 21 km/h are expected.

10-day weather forecast for Pasadena

United States

  1. TodayOct 22Cloudy19°C14°C
  2. FriOct 23Cloudy21°C12°C
  3. SatOct 24Fog24°C13°C
  4. SunOct 25Cloudy27°C19°C
  5. MonOct 26Partly cloudy28°C20°C
  6. TueOct 27Cloudy27°C21°C
  7. WedOct 28Cloudy26°C20°C
  8. ThuOct 29Cloudy23°C18°C
  9. FriOct 30Cloudy22°C17°C
  10. SatOct 31Cloudy20°C16°C

Where in Pasadena is the air worse?

See all sensors

Highest current reading: 2.0 µg/m³ (Del Mar and Euclid). Lowest: 0.0 µg/m³ (NE Pasadena). The list shows every sensor, highest first.

  1. Del Mar and Euclid →2 µg/m³
  2. Pasadena-LL →0 µg/m³
  3. N Los Robles @ Dearborn →0 µg/m³
  4. Las Lunas →0 µg/m³
  5. NE Pasadena →0 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: AirGradient — 5 sensors.

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

41

  1. BellevueUnited States

    4

  2. PortlandUnited States

    4

  3. RenoUnited States

    3

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: Pasadena

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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A card with the current PM2.5 in Pasadena: it is refreshed every 15 minutes and links to this page. Paste the code into your site.

Air quality in Pasadena now — Atmy

United States · City ranking · All pilot cities

Questions

What was the air quality in Pasadena over the last completed day?

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub.

What is the air quality in Pasadena right now?

Right now in Pasadena, PM2.5 averages 0.4 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors on the Atmy network, readings from 10:47–10:47 local time (17:47–17:47 UTC), summary prepared at 11:00 local time. Median: 0.0 µg/m³; range across sensors: 0.0–2.0 µg/m³.

Is it safe to be outdoors in Pasadena 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 Pasadena is the air worse?

Highest current reading: 2.0 µg/m³ (Del Mar and Euclid). Lowest: 0.0 µg/m³ (NE Pasadena). 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