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Atmosphere 2018, 9(6), 226;

A Survey of Regional-Scale Blocking Patterns and Effects on Air Quality in Ontario, Canada

Environmental Monitoring and Reporting Branch, Ontario Ministry of Environment, Etobicoke, ON M9P 3V6, Canada
Received: 10 April 2018 / Revised: 1 June 2018 / Accepted: 6 June 2018 / Published: 12 June 2018
(This article belongs to the Special Issue Air Quality Prediction)
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Blocking weather patterns cause persistent weather situations that alter typical wind and circulation patterns which may result in stagnant weather conditions at the surface and potentially adverse conditions that affect society, such as extended warmth, drought, precipitation or fog. One problem that may develop is adverse concentrations of air pollutants in populated regions that may persist for several days or longer. This study looks for possible correlation between blocking patterns and air quality episodes in southern Ontario, Canada. The method used was examination of various cases of air quality episodes. The meteorological details of these examples were examined to determine possible correlations with blocking patterns. Results of the comparisons revealed that various types of blocking patterns correlated with worsening air quality episodes in various regions of southern Ontario. The conclusion is that some large-scale as well as regional-scale blocking patterns may cause adverse air quality in different cities or regions of the province during any month, and forecasters need to be vigilant for these patterns. View Full-Text
Keywords: air quality; block pattern; ozone; PM2.5; synoptic meteorology air quality; block pattern; ozone; PM2.5; synoptic meteorology

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Dempsey, F. A Survey of Regional-Scale Blocking Patterns and Effects on Air Quality in Ontario, Canada. Atmosphere 2018, 9, 226.

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