Good to moderate air quality expected

Weather Summary: Issued on Monday, February 8, 2010

A surface ridge, currently lying northwest to southeast from northern Manitoba to southwestern Ontario, combined with a low pressure system west of the Great Lakes, are the main weather makers for today and tomorrow. Both systems are forecast to move slowly eastward during today and tomorrow. Light northerly winds and mainly clear skies are expected ahead of the ridge, and increasing cloudiness and easterly winds are expected behind the ridge. By Tuesday evening, the low pressure system is forecast to lie just south of southwestern Ontario, moving eastward during Tuesday night and Wednesday. Precipitation is expected to begin in southwestern Ontario Tuesday evening, and spread eastward during Tuesday night and Wednesday.

Air quality indices are forecast to remain in the good category for today, Tuesday, and Wednesday across all forecast regions.

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Smog, comprised of ozone and/or PM_2.5, is primarily a summer phenomenon, occurring mostly in southern Ontario; however, PM_2.5 can elevate smog levels during all months of the year. For this reason, the ministry reports the AQI hourly, seven days a week; and continues to provide air quality forecasts daily.