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In 2019, New Zealand passed “The Climate Change Response (Zero Carbon) Amendment Act” which included establishing the Climate Change Commission, a Crown entity to provide independent advice to Government to help Aotearoa transition to a climate-resilient and low emissions future. The Climate Change Commission’s first draft advice was released in January 2021 and, amongst other things, highlighted the opportunity to transition away from fossil fuels for domestic space and water heating. Compared to natural gas or LPG the use of wood burners for domestic heating, while a carbon neutral heating option, has the disadvantage of contributing to the deterioration of local air quality. In order to improve winter air quality, Environment Canterbury (ECan) has introduced a pseudo real-life wood burner authorisation test method known as Canterbury Method One (CM1). Appliances passing the CM1 test method qualify as Ultra-low Emission Burners (ULEBs) and are the only wood burning appliances allowed to be installed into houses within clean air zones in Canterbury. This paper provides updated information on the numbers and design trends of ULEBs authorised to date, and comments on how manufacturers have achieved the ULEB performance limits. The ongoing improvement of ULEBs provides the opportunity to transition away from fossil fuels toward a carbon neutral fuel without generating adverse air pollution impacts. This paper provides a summary of the journey to-date. [ABSTRACT FROM AUTHOR]

In the late 1960s, New Zealand and the United States collaborated to establish a southern hemispheric carbon dioxide (CO2) monitoring station on New Zealand's coastal cliffs. The New Zealand CO2 Project, as it came to be known, is an underappreciated landmark in the history of environmental monitoring. The archival record of its early years reveals the extent to which efforts to measure atmospheric carbon dioxide concentrations interacted closely with one of the most hotly debated political issues of the mid-twentieth century: urban air pollution. The designation of CO2 as air pollution on a planetary scale had profound legal implications in an era in which clean air legislation increasingly brought air pollution within the scope of governmental regulation, and administrative agencies began to jostle for control of the monitoring enterprise. The precise nature of CO2 as an air pollutant, however, was difficult to pin down. In these initial years of concerted carbon dioxide monitoring, when the lines between climate science and air pollution research were still blurred, CO2 developed its many pollutant identities. The nature of these identities - and the ways in which scientists and science administrators negotiated their boundaries - retain their relevance today, as nations continue to link air pollution and climate legislation in the twenty-first century. [ABSTRACT FROM AUTHOR]