Sulfur dioxide is not discussed in SoE 2016, because there has been little change since SoE 2011. Values in the capital cities are well below the Air NEPM standards. Exceedances of the 1-hour standard continue to be recorded more than 20 days per year in Port Pirie and Mount Isa because of emissions from ore smelting facilities. Annual maximum 1-hour concentrations are generally 3–4 times the 0.20 ppm standard. The Nyrstar Port Pirie Transformation Project planned for completion in 2017 is designed to reduce maximum emissions by a factor of 5 and average emissions by a factor of almost 10, which should lead to compliance with the Air NEPM.