Guidance for improving subway air quality

This document provides guidance to public transit authorities and their municipal and provincial partners on options to mitigate subway air pollution. It includes background on the sources of subway PM pollution, factors that affect them, a perspective on Canadian subway air quality, and a thorough review of the research on methods to reduce concentrations of PM in subways.

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Additional Info

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Last Updated April 17, 2026, 21:34 (UTC)
Created April 17, 2026, 21:34 (UTC)
criticality_level []
geographic_scope []
open_canada_collection publication
open_canada_date_published 2022-03-31 00:00:00
open_canada_keywords {"fr": ["qualité de l'air", "qualité de l'air du métro", "pollution de l'air du métro", "pollution par les PM du métro", "atténuer la pollution de l'air du métro", "autorités de transport en commun"], "en": ["air quality", "subway air quality", "subway air-pollution", "subway PM pollution", "mitigate subway air-pollution", "public transit authorities"]}
open_canada_subject ["health_and_safety"]
sensitivity_level unrestricted
title_fr Document d’orientation sur l’amélioration de la qualité de l’air dans les métros
update_frequency as_needed