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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) with a cross check gravametric monitor (Partisol 2000).

Town Summary
Air quality in this town

Around 159 kilograms of PM10 is discharged to the air in Tahunanui on a winter's day (2014 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.

  • Population
  • Number of households

This information is collated from 2013 Census information. The census is the official count of how many people and dwellings there are in New Zealand. Census information is collated every five years.

Sources of air pollution

Home heating Industrial Outdoor burning Traffic Indoor sources Natural sources
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    Sources of PM10 emissions

    Source Annual percentage Winter day percentage
    Home heating Home heating {{summary.emissions.annualhome}}% {{summary.emissions.winterhome}}%
    Industrial Industrial {{summary.emissions.annualindustry}}% {{summary.emissions.winterindustry}}%
    Outdoor burning Outdoor burning {{summary.emissions.annualoutdoor}}% {{summary.emissions.winteroutdoor}}%
    Traffic Traffic {{summary.emissions.annualmotor}}% {{summary.emissions.wintermotor}}%
    Relative breakdown
    Winter day

    The table shows the proportions of the main sources of PM10 in this town from home heating, industrial activities, outdoor burning and traffic.  (Indoor sources and natural sources of air pollutants 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 PM10 emissions, which allows comparison between towns throughout New Zealand.  Some regional council published emissions information might differ if they were prepared in a different year or used another method. Contact your regional council for more information about PM10 and other emissions.

Seasonal variation

  • Show wind speed
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Concentration (µg/m3)

Wind speed (km/h)

Air temperature (℃)

What is this graph showing me?

The graph shows the monthly average PM10 concentration at one representative site in this town for the year selected. In many towns in New Zealand, PM10 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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