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Inner City Wellington

Inner City Wellington covers the central business district and its surrounding residential areas to the south west of Wellington Harbour. It is located within the wider Wellington City airshed which has a windy coastal climate.

Air quality is measured at one site, located on the corner of Willis Street and the urban motorway (SH1). The air quality indicators measured here are PM10, PM2.5, nitrogen dioxide and carbon monoxide.

Town Summary
Air quality in this town

Air quality measured at the site is generally good and meets national guidelines and standards. The monitoring site is exposed to winds which helps disperse traffic emissions so they don't build up to unhealthy levels.

Levels of nitrogen dioxide and carbon monoxide are highest during the morning and evening commuter rush hour. Levels of these pollutants also increase during the winter months when there is generally less wind to blow the air pollution away.

  • Population
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  • Number of households
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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
    Annual
    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

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  • Show temperature
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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 Inner City Wellington

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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