Air Quality

Air quality can contribute to your overall health. If you are exposed to toxic chemicals or gases, this may cause serious health issues. Learn how to monitor and test the air quality in your home, workplace and outdoor environment.

Monitor outdoor air quality

A special Air Quality Statement may be issued by the Ministry of the Environment, Conservation and Parks when the quality of the air presents a risk to your health. This may be  a results of weather forecasts, wildfire smoke, pollutants, etc. The following table illustrates the number of Special Air Quality Statements issued for Huron and Perth counties.

Statements Issued
Number of Special Air Quality Statements        

The Air Quality Health Index is a scale that measures the quality of the air locally. Review the Air Quality Health Index and Air Quality Ontario websites to view air quality health index values and forecasts and the impact of air quality on your overall health.

Learn about the actions you can take to improve outdoor air quality.

Air quality in your home

Indoor air quality can affect your health. Learn how to improve indoor air quality in your home.


Radon is a radioactive gas found naturally in the environment. It is produced by the decay of uranium found in soil, rock and groundwater. The gas is invisible, odourless and tasteless; however, it can cause serious health problems. Typically, health issues, such as lung cancer, develop from long exposure in a confined and poorly ventilated space.

You can test your home for radon by hiring a certified radon measurement professional. Visit the National Radon Proficiency Program for a list of certified radon testing companies. You can also test radon levels yourself using a radon test kit. Purchase a radon test kit from your local hardware store.

Carbon monoxide

Carbon monoxide (CO) is a tasteless, odourless and invisible gas that can be dangerous to your health. Make sure to install a CO alarm in your home. The alarm will alert you and your family to the presence of carbon monoxide in the air. Contact your local municipality for more information on the use and installation of carbon monoxide alarms.


Moulds are fungi that can grow indoors in wet or damp areas and can affect your health. Learn how to prevent, identify and manage mould in your home.

Air quality at work

If you are concerned about the air quality at work, contact your regional Ministry of Labour office.

St. Marys Air Quality

Huron Perth Public Health is working with the Ministry of the Environment, Conservation and Parks, the Town of St. Marys, and the St. Marys community to address concerns with the air quality in St. Marys.