Evidence, Clarity, and Public Understanding
The Pearson Accountability Alliance (PAA) is an independent, non-partisan, community-based non-profit. We turn complex aviation, environmental, and public-health information into clear, accessible knowledge so that residents, practitioners, and public institutions can make informed decisions.
Our goal is to help people understand what the law actually requires, how those requirements should be applied in a responsible way, and how airport operations affect residents, community well-being, and the surrounding environment.
What we do
We curate public records, technical data, and lived experience into a coherent picture of how Toronto Pearson operates and what that means for surrounding communities.
Make complex systems understandable
We translate flight paths, runway usage, regulations, and environmental metrics into plain-language explanations, diagrams, and narratives that non-specialists can use.
Maintain a public evidence record
We organize correspondence, official statements, and data releases into a structured, searchable record, so anyone can see what was asked, how it was answered, and where gaps remain.
Support informed public conversation
We prepare summaries, exhibits, and educational materials that can be used by residents, community groups, practitioners, and oversight bodies working to protect health, safety, and the environment.
From Information Delays to a Public Evidence Record
After prolonged delays, Information Commissioner investigations, and formal disclosure orders, many of the federal records sought by PAA are now public. The accountability question has therefore moved beyond simply obtaining records: the released documents can now be examined for what they show about federal oversight of Toronto Pearson, aircraft noise, public health, environmental responsibility, and community concerns.
Major federal disclosures are now public
Transport Canada has released records across multiple PAA access requests concerning night operations, community meetings, environmental jurisdiction, noise-monitor reliability, internal correspondence, and federal oversight. Health Canada has also released a 3,203-page record concerning Pearson-related health correspondence and its internal handling.
A federal health-oversight question has emerged
Health Canada records state that its specialist noise-health branch provides expertise on the health effects of noise upon request from Transport Canada. PAA’s review of the released records did not locate a Pearson-specific Health Canada health-risk assessment applying that expertise to the community exposure evidence submitted, or a documented Transport Canada request asking Health Canada to conduct such an assessment.
Independent oversight continues
Several access files remain subject to Office of the Information Commissioner review, including issues involving search completeness, withheld records, severance, and the adequacy of departmental searches. PAA continues to publish the underlying responses and release packages so the public can examine the source record directly.
View the complete Access to Information & Oversight Record →
How to use this site
If you are new to the Pearson Accountability Alliance, the best place to begin is the Evidence Hub. From there, you can drill down into specific themes such as operations, noise, air quality, and lease obligations.
- Use the Evidence Hub link in the top navigation, or the Enter the Evidence Hub button above, to browse our main evidence collections.
- Use the Access to Information & Oversight Record to review federal requests, OIC investigations and orders, response letters, and the underlying records released by Transport Canada and Health Canada.
- Visit About to learn more about who we are, our mission, and how this work is organized.
- Use Contact if you are a resident, journalist, practitioner, or public official seeking specific information or source material.
- Click Join the Alliance if you wish to support our research or become a supporting member.
What our Ground Lease review revealed
After years of attending consultations and receiving inconsistent explanations, the community decided to examine the federal Ground Lease directly. We read all 500 pages of the agreement between the Government of Canada and the GTAA.
What we found was clear: many of the messages presented to residents over the years do not align with the obligations set out in the actual lease. Much of what communities were told — about wind, runway selection, demand forecasting, and what “cannot be changed” — was not grounded in engineering requirements or statutory limitations.
Key discoveries
- The Ground Lease requires meaningful environmental stewardship, community consultation, transparency, and public reporting — responsibilities that are not being met in practice.
- Operational explanations often repeated in public meetings — including claims that wind “fully dictates” configurations — are contradicted by actual ATIS, METAR, and field-specific wind data.
- Lease provisions require the GTAA to operate in the public interest, not solely to maximize throughput. Yet operational decisions routinely prioritize demand and capacity over respite, noise mitigation, or health.
- The message that “traffic will double by 2037 and nothing can be done” is a communications narrative — not a requirement of the lease, not federal law, and not an engineering inevitability.
These findings revealed a significant gap between public communications and contractual reality. PAA was created to close that gap by providing residents with direct access to the facts, the documents, and the science — rather than narratives shaped by communications teams.
Project Roadmap: The path to independent monitoring
We do not yet operate our own noise-monitoring network, but the foundation is being built in deliberate phases:
- Phase 1 (Live): Maintaining the Evidence Hub, publishing federal Access to Information disclosures, documenting OIC findings and investigations, and building a source-linked public record of federal oversight at Toronto Pearson.
- Phase 2 (In progress): Technical evaluation of reliable, affordable Class-1 NMT hardware and data workflows suitable for Canadian climates and community deployment.
- Phase 3 (Goal): Deploying a distributed sensor network in the blue-collar flight corridors currently underserved by official monitoring stations.
Join the Alliance
Your support helps advance community science and public-interest research. Contributions assist with technical evaluation, legal filings, equipment procurement, and the careful preparation of public-facing evidence.
If you would like to follow our work more closely, including updates on OIC investigations and NMT research, you can subscribe for email updates below.
Join as a Supporting Member or sign up for email updates
Pearson Accountability Alliance is a registered non-profit organization currently seeking charitable status. We are fully independent of the GTAA and NAV CANADA.
Pearson Accountability Alliance
Independent Environmental & Public Health Research for Toronto Pearson Communities.