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  Services » Publications » Technical reports - by year » TR201631

Air Emission Inventory - Tokoroa and Morrinsville 2016

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Report: TR 2016/31

Author: Emily Wilton (Environet Ltd)

About this report

Waikato Regional Council monitors air quality across the region, including levels of particles in 20 airsheds. Changes in particle emissions and the contribution of different sources to these emissions over time are regularly assessed through emission inventories.

An emission inventory is an estimate of the amount of a pollutant 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.

This report provides an updated estimate of emissions to air and the contribution of different sources to these emissions in Tokoroa and establishes a baseline estimate of emissions to air and the contribution of different sources to these emissions in Morrinsville. A previous assessment of emissions to air for Tokoroa was carried out in 2012. No previous emissions inventory has been carried out for Morrinsville.

The focus of this emission inventory is the emission of fine particulate matter (PM10), which are the particles that are small enough to be inhaled and are produced from sources such as domestic fires, vehicles and industry.

This 2016 Emission inventory has determined that home heating is the main source of PM10 emissions in Tokoroa accounting for 87% of daily winter emissions. The other main source is outdoor burning which contributes 10%. There has been a 32% reduction in wintertime PM10 emissions in Tokoroa since 2012 with the majority of reductions estimated to have occurred in home heating emissions.

In Morrinsville the contribution from home heating was 53% with industry being the next largest contributor to PM10 at 42%.

The emission reductions estimated for Tokoroa are consistent with actual improvements observed in air quality over this period.

Read or download the report

Air Emission Inventory - Tokoroa and Morrinsville 2016 [PDF, 1.8 MB]


1 Introduction 3
2 Inventory design 4
3 Domestic heating 7
4 Motor vehicles 21
5 Industrial and commercial 23
6 Outdoor burning 25
7 Other sources of emissions 27
8 Total emissions 28
  References 37
  Appendix A: Home heating questionnaire 38
  Appendix B: Emission factors for domestic heating 39
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