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    The Use of Critical Levels for Determining Plant Response to Ozone in Europe and in North America by Robert C. Musselman, Allen S. Lefohn

    Published 2007-01-01
    “…A major obstacle for utilization of critical levels in North America is that ambient air quality standards for O3 in the U.S. and Canada are concentration based. …”
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    Spatial Variability and Application of Ratios between BTEX in Two Canadian Cities by Lindsay Miller, Xiaohong Xu, Amanda Wheeler, Dominic Odwa Atari, Alice Grgicak-Mannion, Isaac Luginaah

    Published 2011-01-01
    “…This paper characterizes benzene, toluene, ethylbenzene, o, and (m + p)-xylene (BTEX) concentrations and relationships among BTEX species in the two cities during the fall sampling periods. …”
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