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Outdoor Air

Although indoor air is often more polluted than outdoor air, sometimes opening windows can let in unwanted allergens and irritants.


  • If you are allergic to pollen or mould or affected by outdoor pollution levels, monitor forecasts through your local weather channel or online at
  • When pollen, mould, or pollution levels are high, it may be more important to keep your windows closed than to ventilate your home.
  • Pollen levels tend to be higher in the morning, whereas air pollution levels tend to build up to higher levels in the late afternoon.
  • Pollen levels are higher on warm, sunny, windy days.
  • Smog alerts often occur on hot sunny days.
  • Although pollen levels drop on rainy days, wet weather can lead to increased outdoor moulds.
  • Air conditioning can be helpful to reduce your exposure to pollen and air pollution on hot days, as well as reduce your indoor humidity.

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