A Guide to the Ontario air quality index system
By: prepared by Air Resources Branch, Ontario Ministry of the Environment.
Contributors: Mignacca, D.; Ontario. Air Resources Branch.
Publisher: The Ministry
Published: 1991
Place of publication: [Toronto]
Language: eng
Number of pages: 31
Subjects: Air quality -- Ontario; Air -- Pollution -- Ontario
Notes: "Report prepared by: D. Mignacca ... [et al.]"

Includes bibliographical references.