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Air Pollution Control air pollution problem Air Pollution Section air quality airborne particles allowable limit ambient air amount apparatus atmospheric pollution average concentration By-law 9 By-Law Number carbomonoxyhemoglobin carbon monoxide City of Montreal Claude Drouin combustion complaints Department of Health Descarrieres Director dustfall electrostatic precipitators emission standards employees equipment fallen dust Federal Government figures fuel garbage gases Health Department hydrogen sulfide incinerators increase inspectors installation Jean Marier Laval Industrial Association legislation Lucien Saulnier maximum McGill University Montreal Department Montreal East Montreal Urban Community municipal incinerator nitrogen oxide number of inspections operation oxide particulate matter Pointe-aux-Trembles Pollution Control Division Pollution Control Section pollution in Montreal pollution levels prohibited Provincial Health Regulations Public Health Quebec Railway Observations RDOH refuse sampling stations smoke soiling index substances sulfur dioxide sulfuric acid Table temperature inversions tons Total Inspections yearly average