Pearson Accountability Alliance

Acacia Park Noise Monitor — 2025 Overnight Noise Audits

This page publishes month-by-month overnight noise audits for the Acacia Park community noise monitor. Each audit focuses on the concentration, intensity, and timing of aircraft noise events during typical sleep hours — generally between 11:00 p.m. and 7:00 a.m.

These audits provide an independent, verifiable record of what the Acacia monitor actually captured during 2025. Each file includes noise-event counts, timestamps, maximum dB values, and runway-procedure associations where available.

For each month you will find:

  • Summary report — a visual, resident-friendly overview (PDF and XLSX).
  • Events dataset — the full, time-stamped events table (PDF and XLSX).

Resident downloads are suitable for sharing with neighbours, elected officials, and community groups.
Investigator files provide structured data for researchers, journalists, legal counsel, and public agencies who need to verify or reproduce the analysis.

Why Acacia Park matters

The Acacia Park noise monitor is one of the most important community monitors in the Pearson network. It sits beneath extremely dense nighttime arrival paths and provides essential ground-truth evidence of the noise burden experienced by residents.

Over the past two decades, residents have repeatedly documented periods where the Acacia monitor was partially or fully offline — including a three-month outage in 2023. At no point was the public transparently told that the monitor was down, even as its data continued to be used as if it represented “normal” conditions.

Missing data is not “quiet.” It simply means nothing was measured. When institutions present data without disclosing monitor outages, the public, policymakers, and health authorities are misled into believing that night noise levels are lower or more intermittent than they truly are.

Status of institutional information
Last updated: January 9, 2026

On January 9, 2026, Pearson Accountability Alliance submitted formal requests to the GTAA, NAV CANADA, and Transport Canada seeking complete Noise Monitoring Terminal (NMT) outage logs for Acacia Park and the entire Pearson noise monitoring network.

Requested records include:

  • dates and durations of outages,
  • reasons for failures or degraded performance,
  • maintenance logs,
  • configuration changes,
  • data-capture availability for each monitor.

Once the requested records are released, this page will be updated to reflect the information provided.

Until then, the monthly audits below represent what the monitor successfully captured — not a guarantee that the institutional monitoring system was functioning reliably throughout the year.

2025 Year Overview (Acacia Park)

Read together, the 12 monthly audits show a year of dense, repetitive night noise exposure over Acacia Park. While the exact counts and dB values for each month are documented inside the summaries and datasets, several broad patterns matter:

  • Overnight aircraft noise is not an occasional event — it is a recurring, structured part of Pearson’s operating pattern.
  • Many nights show clusters of high-dB events compressed into short time windows, increasing the likelihood of repeated awakenings and fragmented sleep.
  • The pattern is systemic, not accidental: similar runway configurations and track densities reappear month after month, particularly during the restricted hours.

Download all 2025 Acacia Park audit files (ZIP)

For investigators and organizations who need the full record in one package, all 2025 summary reports and events datasets can be downloaded as a single archive.

Download ZIP Archive

(If this link is not yet active, individual monthly files remain available below.)

2025 Monthly Audits

January 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

February 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

March 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

April 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

May 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

June 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

July 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

August 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

September 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

October 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

November 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

December 2025 Audit

Resident downloads:
Summary Report (PDF) | Events Dataset (PDF)

Investigator files:
Summary (XLSX) | Dataset (XLSX)

For workers and unions:

If repeated night noise from Pearson is affecting your sleep and safety at work, you can bring this evidence to your union. We provide a ready-to-use letter and flyer here: → Resources for Workers & Unions

Pearson Accountability Alliance

Independent Environmental & Public Health Research for Toronto Pearson Communities.