Daily Air Quality
City · 2023–2025
PLACE BY YEAR
| 2023 | 2024 | 2025 | |
|---|---|---|---|
| City | available | available | available |
WHAT IT MEASURES
This dataset reports daily air quality readings for Milwaukee, collected by the MKE FreshAir Collective (a non-profit that runs a network of consumer-accessible air sensors). Each row is one day and is the daily average across all sensors active that day. It covers 2023, 2024, and 2025, and the number of sensors in the network grew over that time. AI
COLUMN GUIDE
| COLUMN | DESCRIPTION | TAG |
|---|---|---|
Day | The calendar date the daily average applies to. AI | AI |
AvgAQI | The average Air Quality Index (AQI, a standard scale that turns pollution levels into a single number for how healthy or unhealthy the air is) across all active sensors that day. AI | AI |
AvgPM2_ | The average concentration of PM2.5 (fine airborne particles 2.5 micrometers or smaller across, small enough to get deep into the lungs) across all active sensors that day. AI | AI |
AvgPM10 | The average concentration of PM10 (airborne particles 10 micrometers or smaller across, including dust and pollen) across all active sensors that day. AI | AI |
AvgPM1 | The average concentration of PM1 (very fine airborne particles 1 micrometer or smaller across) across all active sensors that day. AI | AI |
CAVEATS
- Each value is a citywide daily average of sensor readings, so it can hide differences between neighborhoods. AI
- The number of sensors changed over time, with a different number active each year, and it also varied day to day because of new installations and technical outages, so comparisons between years or days may not be like for like. AI
- The source gives no margins of error and does not say where the sensors are located or how often readings are taken, and the equipment is consumer-accessible rather than described as regulatory grade. AI
- Confirm methods, calibration, and timing with the MKE FreshAir Collective before citing any figures. AI
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STORY ANGLES
- How does the air quality that community-run sensors measure in Milwaukee compare across the three years, accounting for the growing sensor network? AI
- Which days or seasons had the worst readings, and what local events or weather might explain them? AI
- Do the volunteer network's readings line up with official monitoring from local and state agencies, and where do they differ? AI
SOURCES
MKE FreshAir Collective: MKE FreshAir Collective, Inc. is a 501(c)(3) non-profit in Milwaukee, WI, run by environmental enthusiasts and concerned residents, and it publishes air quality data for the city. It says it collects and analyzes measurements of ozone, PM2.5, and volatile organic compounds using consumer-accessible equipment and the latest scientific methods, and it works with local and state agencies and community groups. The page does not say how many monitors it uses, where they are located, or how often readings are taken or updated, and it gives no margins of error, so reporters cannot tell coverage or precision from this page alone. It describes its equipment only as consumer accessible, and its current air quality link points to a third-party IQAir map, so reporters should confirm the methods, calibration, and timing directly with the organization before citing figures. SOURCE