Chicago Launches Largest Community Air Monitoring Network

CDPH and UIC School of Public Health release data from 277 sensors across the city

Feb. 4, 2026 at 9:39am

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The Chicago Department of Public Health (CDPH) and the University of Illinois Chicago (UIC) School of Public Health have publicly released data from Open Air Chicago, the largest community air monitoring network in the country and second largest in the world. Over six weeks in summer 2025, 277 sensors were installed across the city to measure fine particulate matter and nitrogen dioxide, providing hyperlocal air quality data to empower residents.

Why it matters

Access to accurate, transparent air quality data is crucial for public health, as certain populations are more vulnerable to air pollution. By sharing this information, the project aims to help Chicagoans understand the air they breathe and make informed choices to protect their health and communities.

The details

The Open Air Chicago network supplements the local air quality data currently available on AirNow.gov, which includes data from federal-grade monitoring systems. The sensors were installed using a scientific, grid-based approach across the city with input from a community advisory board. The network name underscores the openness and transparency of the process, project, and data.

  • Over six weeks in summer 2025, the sensors were installed across Chicago.
  • The data from Open Air Chicago was publicly released last week.

The players

Chicago Department of Public Health (CDPH)

The local public health department that partnered with UIC to launch the Open Air Chicago network.

University of Illinois Chicago (UIC) School of Public Health

The academic institution that collaborated with CDPH on the Open Air Chicago project, providing expertise and support.

Olusimbo 'Simbo' Ige, MD, MS, MPH

The CDPH Commissioner who stated that the project empowers residents to make health decisions based on science.

Wayne H. Giles, MD, MS

The dean of the UIC School of Public Health who said the project combines air monitoring, academic expertise, and democratized public health data.

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What they’re saying

“The power of public health is now in the hands of the public.”

— Olusimbo 'Simbo' Ige, MD, MS, MPH, CDPH Commissioner (chicago.gov)

“Open Air Chicago combines cutting-edge air monitoring, academic expertise and democratized public health data.”

— Wayne H. Giles, MD, MS, Dean, UIC School of Public Health (chicago.gov)

What’s next

The Open Air Chicago data is now available through the Clarity Open Map and the Chicago Open Data Portal, allowing residents to access hyperlocal air quality information and sign up for alerts.

The takeaway

By providing transparent, accessible air quality data, the Open Air Chicago project empowers residents to make informed decisions to protect their health and communities, demonstrating the power of public-academic partnerships in addressing critical public health issues.