Emissions inventories provide information that is crucial to our understanding of the sources of air pollution. They assist in determining how to tailor reduction strategies to achieve the most effective improvements in air quality. While inventories provide reasonably rough quantification of PM10 sources, they are the best available tool. More advanced techniques such as source apportionment are showing some encouraging results, but currently require further development.
Inventory results summarised in this report indicate that home-heating fires, typically used during winter, cause the largest proportion of PM10 emissions in New Zealand. In some other areas and at different times, vehicles, industry and some natural sources can be more significant. Readers should be aware that some of the inventories were developed using different methods and therefore are not directly comparable to each other.
This technical report on the sources of fine particles (PM10 - particles less then 10 microns in diameter) in New Zealand will assist with the development of appropriate national environmental standards for air quality, such as ambient standards for PM10 and the proposed emission standard for domestic solid fuel burning appliances.
The information contained in this report is not government policy. It has been released for information only and forms part of the section 32 analysis required for standards development. It is one of four background reports on PM10, with the others covering: monitoring results, amenity issues and health effects.
I'd like to thank all those councils and others who have contributed data and information for this report.