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Good air quality is fundamental not only to people’s health and well-being but also to the quality of the natural and physical environment. This report card tracks air quality against national standards and guidelines that set acceptable levels for key pollutants. It presents information on ambient (outdoor) levels of carbon monoxide, nitrogen dioxide, sulphur dioxide and ozone in areas where these pollutants are monitored. Particulate matter that is less than 10 microns in diameter (PM10) is reported in a separate report card.