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Tahunanui is a coastal flat bounded by the Port Hills on one side and Tasman Bay on the other. The area was developed for housing early in Nelson's settlement and contains a range of housing ages. Tahunanui also contains the city's largest light industrial area which contains a number of industrial boilers, as well as transport emissions from vehicles on State Highway 6 and main roads to the airport. It has one PM10 monitoring site.

PM10 has been monitored at a number of different sites within Tahunanui. The current monitoring site was established in 2007 and is located within a reserve area between industrial and residential land uses. The main state highway runs to the south and east of the monitoring site. A meteorological monitoring site is co- located with the PM10 monitor and a second meteorological site is located on the crest of the Port Hills to the north east. PM10 monitoring is undertaken using a real time monitor (Thermo FH62). PM2.5 is currently being monitored with a parisol 2025i monitor.

Town Summary
Air quality in this town

Around 138 kilograms of PM10 is discharged to the air in Tahunanui on a winter's day (2020 emissions inventory). This compares with an estimated 285 kilograms per day for 2006.

Tahunanui's air quality is impacted by domestic home heating, industrial emissions (boilers), transport emissions and from natural sources (dust and marine aerosol). The airshed is considered to be close to complying with the National Environmental Standards for air quality. Recorded exceedances over summer are caused by fine wind blown dust thought to be from roads and unpaved areas.

Sources of air pollution

Home heating Industrial Outdoor burning Traffic Indoor sources Natural sources
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    • Sources of PM10 emissions
    • Sources of PM2.5 emissions
    • Sources of NOx emissions
    Source Annual percentage Winter day percentage
    Home heating Home heating {{emissions.annualhome}}% {{emissions.winterhome}}%
    Industrial Industrial {{emissions.annualindustry}}% {{emissions.winterindustry}}%
    Outdoor burning Outdoor burning {{emissions.annualoutdoor}}% {{emissions.winteroutdoor}}%
    Traffic Traffic {{emissions.annualmotor}}% {{emissions.wintermotor}}%
    Relative breakdown
    Winter day

    The table shows the proportions of the main sources of PM10, PM2.5 and nitrogen oxides (NOx) in this town from home heating, industrial activities, outdoor burning and traffic.  (Indoor, natural and shipping sources are not included in this breakdown). 

    These values come from 2013 data sourced from MfE’s data service.  Consistent methodology was used to calculate these estimates of PM and NOx emissions, which allows comparison between towns throughout New Zealand.  Regional council or unitary authority published emissions information might differ if they were prepared in a different year or used another method. Contact your regional council or unitary authority for more information about PM and other emissions in your area.

Seasonal variation

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  • Show temperature



Wind speed (km/h)

Air temperature (℃)

What is this graph showing me?

The graph shows the monthly average PM concentrations at one representative site in this town for the year selected. In many towns in New Zealand, PM peaks in the winter when air temperatures and wind speeds are lowest as more people heat their homes during colder weather, and still conditions mean that there is no wind to disperse the air pollutants.

Sites 1
Monitored sites in Tahunanui

Monitored sites in this town can be categorised according to location:

  • Residential: Air monitoring site is in a suburban area with a relatively high population density, but not close to a busy road or industry.
  • Traffic: Air monitoring site is very close to a busy road or intersection.
  • Industry: Air monitoring site is close to industry, including heavy commercial and processing factories.
  • Coastal: Air monitoring site is close to the coast where there are high levels of sea salt in the air.
  • NES: A site monitored for compliance with the National Environmental Standards for Air Quality (NES-AQ).

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