Report: TR 2015/29
Author: Emily Wilton, Environet Ltd
This report provides updated estimates of the sources of emissions to air and the contribution of different sources to these emissions in Te Kuiti and Putaruru. A previous assessment of emissions to air for Te Kuiti was carried out in 2007 and in 2006 for Putaruru.
An emission inventory is an estimate of the amount of a contaminant emitted by a particular source and the combined emissions from all sources. Information on emissions is collected from household surveys on home heating fuel usage, vehicle fleet databases and industrial emission testing information held by Waikato Regional Council.
Emission inventories help explain changes in air quality that have been identified through Council’s air quality monitoring programme and to inform Council’s decision making around the management of air quality.
This 2015 Emission inventory has determined that domestic heating is the main source of PM10 emissions in Te Kuiti accounting for 78% of daily winter emissions. The other main source is industry which contributes 16%. There has been a 14% reduction in wintertime PM10 emissions in Te Kuiti since 2007 as a result of reductions in both domestic heating and industrial emissions.
In Putaruru the domestic heating contribution was 96% with only minor contributions from outdoor burning, vehicles and industry. A reduction in daily winter PM10 emissions of around 63% is estimated for Putaruru since 2006 as a result of reductions in both domestic heating and industrial emissions.
The emission reductions estimated for both Putaruru and Te Kuiti are consistent with actual improvements observed in air quality over this period.
Subsequent to publication of this report, some minor errors were identified for the domestic heating methods data for Putaruru. The corrected summary for Putaruru is as follows:
In Putaruru the domestic heating contribution is 94% (127 kilograms per day) with minor contributions from outdoor burning and transport. Around 135 kilograms per day of PM10 is discharged in Putaruru on an average winter’s day. A reduction in daily winter PM10 emissions of around 62% is estimated to have occurred from 2006 to 2015. The reduction in domestic heating emissions over this time is around 38%.
Air emission inventory – Te Kuiti and Putaruru 2015 (PDF 1.6 mb)
|2.1||Selection of sources||4|
|2.2||Selection of contaminants||4|
|2.3||Selection of areas||4|
|3.2||Home heating methods in Te Kuiti||8|
|3.3||Home heating methods in Putaruru||9|
|3.4||Emissions from domestic heating in Te Kuiti||11|
|3.5||Emissions from domestic heating in Putaruru||15|
|4.2||Motor vehicle emissions||22|
|5||Industrial and commercial||23|
|5.2||Industrial and commercial emissions||24|
|6.2||Outdoor burning emissions||26|
|7||Other sources of emissions||27|
|Appendix A||Home heating questionnaire||35|
|Appendix B||Emission factors for domestic heating||40|