Good to moderate air quality expected

Weather Forecast: Issued on Monday, July 28, 2014

The main weather factors affecting air quality indices the next several days include:

Monday:
- a low pressure trough is centered over New York State and is causing mainly cloudy skies across the forecast regions along with showers or thundershowers and northwesterly winds
-the low is forecast to track to the northeast during Monday and partly to mainly cloudy skies with a northwesterly flow are forecast to continue with scattered showers expected mainly for eastern Ontario
-below seasonal temperatures and less humid conditions are forecast

Tuesday and Wednesday:
-an upper trough is forecast to remain over the region and is forecast to cause continuing partly to mainly cloudy skies with scattered showers or thundershowers
- a mainly northwesterly flow and below seasonal temperatures are expected to persist

Air quality forecast:
A clean northwesterly flow is the main weather factor forecast to cause air quality indices to generally be in the good category for the next several days.


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Smog, comprised of Ozone (O3) and/or Fine Particulate Matter (PM2.5), is primarily a summer phenomenon, occurring mostly in southern Ontario; however, PM2.5 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.