Madison air quality now

United States · The summary is refreshed every 15 minutes.

October 22

The air is clean now

Madison

15°C

Clear

40AQI

1023hPa

Atmospheric
pressure

78%

Humidity

Madison, October 21, 2026: daily mean PM2.5 18 µg/m³ (4 sensors), level “Moderate” — as in the Atmy Data Hub. Now (13:00 local time): 7.2 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Madison, PM2.5 averages 7.2 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 12:47–12:47 local time (17:47–17:47 UTC), summary prepared at 13:00 local time. Median: 5.9 µg/m³; range across sensors: 3.8–13.4 µg/m³.

In Madison the air is good right now (approximate, US EPA scale). From 00:00 to 13:00 local time the city mean PM2.5 fell from 15.8 to 7.2 µg/m³. The highest hour was 09:00 with 25.3 µg/m³.

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

Weather now: clear, 15°C, wind 1 m/s, humidity 78%. No major change in the wind is expected in the coming hours. By 00:00 the temperature will be about 12°C.

Written automatically at 13:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

4 km/h

Wind, E

0 mm

Precipitation today

Madison: air quality for the completed day

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

18 µg/m³ Moderate

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 18 µg/m³ from 4 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

Madison: 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
10
-
8
11
6
11
10
5
3
6
25
14
6
6

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

9%An estimate of weather conditions · not a PM2.5 forecast

Now98
13.0021.0004.0012.00

Pollution accumulation forecast

Today — October 22

21°/7°

Index by time of day

55/100Moderate

  1. 55/100Night
  2. 46/100Morning
  3. 10/100Day
  4. 22/100Evening

Friday — October 23

21°/9°

Index by time of day

54/100Moderate

  1. 54/100Night
  2. 40/100Morning
  3. 8/100Day
  4. 18/100Evening

Saturday — October 24

20°/10°

Index by time of day

43/100Moderate

  1. 43/100Night
  2. 30/100Morning
  3. 4/100Day
  4. 16/100Evening

Sunday — October 25

21°/12°

Index by time of day

40/100Moderate

  1. 40/100Night
  2. 31/100Morning
  3. 7/100Day
  4. 22/100Evening

Monday — October 26

12°/7°

Index by time of day

26/100Low

  1. 26/100Night
  2. 22/100Morning
  3. 5/100Day
  4. 17/100Evening

Tuesday — October 27

7°/7°

Index by time of day

31/100Low

  1. 31/100Night
  2. 23/100Morning
  3. 6/100Day
  4. 16/100Evening

Forecast of conditions that trap pollution near the surface

Weather

15°

Clear. Feels like 15°C

  1. MorningPartly cloudy11°C87%
  2. DayClear21°C44%
  3. EveningClear13°C64%

Wind

4km/hWind from the E

7km/hWind gusts

Wind force: 1

Light wind is expected over the next few hours.

10-day weather forecast for Madison

United States

  1. TodayOct 22Cloudy21°C7°C
  2. FriOct 23Cloudy21°C9°C
  3. SatOct 24Cloudy20°C10°C
  4. SunOct 25Cloudy21°C12°C
  5. MonOct 26Cloudy12°C7°C
  6. TueOct 27Rain7°C7°C
  7. WedOct 28Rain17°C7°C
  8. ThuOct 29Cloudy13°C3°C
  9. FriOct 30Cloudy11°C1°C
  10. SatOct 31Rain12°C5°C

Where in Madison is the air worse?

See all sensors

Highest current reading: 13.4 µg/m³ (Woodrow Street). Lowest: 3.8 µg/m³ (Meadowood). The list shows every sensor, highest first.

  1. Woodrow Street →13 µg/m³
  2. willy x ingersoll →7 µg/m³
  3. Westmorland - Madison, WI →5 µg/m³
  4. Meadowood →4 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: AirGradient — 4 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: Madison

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

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

Widget for your site

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

Air quality in Madison now — Atmy

United States · City ranking · All pilot cities

Questions

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

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 18 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 Madison right now?

Right now in Madison, PM2.5 averages 7.2 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 12:47–12:47 local time (17:47–17:47 UTC), summary prepared at 13:00 local time. Median: 5.9 µg/m³; range across sensors: 3.8–13.4 µg/m³.

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

Highest current reading: 13.4 µg/m³ (Woodrow Street). Lowest: 3.8 µg/m³ (Meadowood). 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.

Is the air in Madison polluted?

Over the last 311 days with data, the mean daily PM2.5 in Madison was 9.9 µg/m³ — 2.0 times the WHO annual guideline (5 µg/m³). Over the last 30 days: — µg/m³. From Atmy's archive of daily city means.

When is the air in Madison cleanest?

In Atmy's daily archive, the cleanest month of the last year was May 2026: 2.7 µg/m³ on average.

When is the air in Madison most polluted?

The most polluted month of the last year was July 2026: 25.4 µg/m³ on average.

Is the air in Madison worse in the heating season?

From November to March the mean daily PM2.5 was 9.8 µg/m³, from June to August 15.1 µg/m³ (last 365 days).

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