The Australian and New Zealand Standard AS/NZS 4013 - "Domestic solid fuel burning appliances: Method for determination of flue gas emission" was published by Standards Australia and Standards New Zealand in 1999, and set the limit for particle emissions from woodheaters at 4g of particulates per kilogram of fuel burnt, averaged over three burn cycles. The standard was initially adopted voluntarily in Australia and New Zealand, and has become mandatory under state legislation in Australia.
New Zealand introduced national environment standards in 2005 which required all new wood burners installed on properties less than two hectares to have a maximum particle emission of 1.5g/kg and a minimum efficiency of 65% when tested in accordance with AS/NZS 4012/4013. More stringent rules are applied in some regional councils. In Christchurch new woodheaters must be less than 1g/kg, and heaters over 15 year old are prohibited (see Environment Canterbury website for details). In some air zones in Otago, particle emissions from new woodheaters must be less than 0.7g/kg.
This graph shows the distribution of emission ratings for woodheater models approved for urban areas in Australia and New Zealand (as at March 2010). Only 6 models are listed with emissions 1g/kg or less in Australia.