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​In line with our Environmental Authority (EA) regulated by the Queensland Government, we measure and track air quality through:

  • short-term hourly results
  • daily average results
  • annual average results.

In addition to our rigorous internal monitoring and auditing processes, the Queensland Government Department of Environmental Science (DES) has independent access to Mount Isa air quality monitoring network data, with information provided hourly and automatically.

DES regulates our performance and is responsible for ensuring we comply with the strict conditions of our EA and all other relevant environmental legislation.

We aim to perform better than the limits in our EA to maintain compliance and to minimise impacts to our community where we work and live.

We encourage Mount Isa residents to review air quality results:​​

Short-term hourly results

Under our EA, we must manage operational emissions to ensure sulphur dioxide concentrations in Mount Isa stay below an hourly average of 570 micrograms per cubic metre of air 98% of the time.

Daily average results

These results focus on managing sulphur dioxide emissions averaged over a 24-hour period of exposure. Under our EA, daily average sulphur dioxide concentration must stay below 230 micrograms per cubic metre of air 99% of the time. We cannot exceed a daily average sulphur dioxide concentration of 230 micrograms per cubic metre of air for more than three days at any station in Mount Isa. Our monitoring results are calculated as percentile values at each monitoring location on a calendar year basis with averaging times based on whole clock hours and calendar days.

Annual average results

Under our EA, we must achieve an annual average sulphur dioxide concentration of 57 micrograms per cubic metre of air or less. This is calculated by averaging the hourly sulphur dioxide emission values from 1 January to 31 December.

Community feedback hotline

We encourage Mount Isa residents to contact our 24-hour Community Feedback Hotline on 1800 982 982 if they believe they are being impacted by our operations.

Our air quality monitoring network

Mount Isa's air quality monitoring network is one of the largest of any city in Australia.