***** If you or your organization would like to sign this letter, please make a submission below. It will be added to the signature list shortly thereafter.*****

The use of lower-cost air quality sensors to gauge exposure to air pollution has exploded in recent years. This explosion has given us an unprecedented sense for how rapidly air quality can differ across a country, city, neighborhood or even a block. For clean air advocates, the proliferation of air quality sensors has been a powerful trend, given that access to basic air quality data is a critical first step for addressing air pollution in communities. 

Much of the power of air quality data gathered by scientists, researchers, and community members comes from the ability of those who create the data to share that data as they see fit. While many other industries are eroding consumer’s data rights, so far the majority of the air quality sensing industry has kept ownership of the data in the hands of those generating it. To ensure the data we gather can be used for maximal social value, we want to see it stay this way.

We, the undersigned air quality experts, advocates, and funders, are publicly stating that we will preferentially support, where logistically, legally, technically, and politically feasible, “open-ready” air quality sensing equipment that: 

• Grants ownership of air quality data to the purchaser of the equipment, and therefore;

• Legally allows the purchaser to share data publicly on a platform of their choice

For the larger community, including national and local governments, we ask that you please take these ‘open-ready’ specifications into consideration for your next purchase of equipment. We collectively have the power to continue to shape the air quality ecosystem to best serve us and our mission to advance clean air worldwide.

This message has been signed by the following air quality experts, advocates, funders, and others in and around the air quality community (in alphabetical order by last name or organization). 

**Organizational Signatories**

Aeroqual Ltd

Air Aware Labs

AirGradient

Airnode Ltd

AirQo

airqoon

Allin-Wayra, IGAC

AQMesh - Environmental Instruments

ATMO®

Barcelona Supercomputing Center

Breathe2Change, Laboratorio de Estudios Atmosféricos

Carbo-X Private Limited

Clarity Movement Co.

Clean Air Initiative Cameroon 

Clean Air One Atmosphere

Clean Air Fund

Crusaders Air Limited

Datahub360 Nigeria 

The Ella Roberta Family Foundation

Energy Policy Institute at the University of Chicago (EPIC)

**Individual Signatures**

Andrés Daniel Brios Abanto, Environmental Assessment and Enforcement Agency (OEFA)

Bhupesh Adhikary, International Centre for Integrated Mountain Development (ICIMOD)

Peter Nkashi Agan, Federal University Wukari Taraba State

Luchiian Alexandru, Strop de aer

James Allan, University of Manchester / NCAS

George Allen, NESCAUM

Ramón Alvarez, Environmental Defense Fund

Joshua Apte, University of California, Berkeley

Harrison Ashangwa, Clean Air Initiative Cameroon 

Jair Rafael Carrillo Avila

Tanishq Rajendra Bangal

Bishwa Bandhu Timsina, CHNF

África Barreto, AEMET

Aarsh Batra, biteSizedAQ (github.com/AarshBatra/biteSizedAQ)

Sisi Batsaikhan, Breathe Mongolia Clean Air Coalition

Luis Carlos Belalcazar, Universidad Nacional de Colombia

Daniel Bernal, AireCiudadano 

Karien Bezuidenhout and Helen Turvey, Philanthropy Matters

Chetan Bhattacharji

Solomon Bililgn, North Carolina A&T State University

Dr. Zaeem Bin Babar, Assistant Professor | Air Quality & Air Pollution Expert
Institute of Energy and Environmental Engineering, University of the Punjab, Lahore, Pakistan

Douglas Booker, University of Leeds

Mike Brand

Michael Brauer, University of British Columbia

Núria Castell, NILU

Hannah Calder

Baris Can Ustundag, airqoon

Lokendra Chauhan, Qen Labs Inc.

Douglas Collins, Bucknell University

Nicole Cowell, Imperial College London

Kevin Czajkowski, University of Toledo

Sunil Dahiya, Envirocatalysts

Charlotte Day

Dirk de Bruin

Priyanka deSouza, University of Colorado Denver

Langley DeWitt, IGAC Project

Sebastian Diez, Universidad del Desarrollo

Shannon Dosemagen, Open Environmental Data Project and Open Science Hardware Foundation