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Navigation tip: find out about sources of air quality pollutants and seasonal air quality patterns in this town by selecting the town name above. View regional summary results by selecting Air Quality.

Nelson at Blackwood St

The Blackwood St monitoring site in Tahunanui consists of a BAM (Thermo Anderson FH-62) continuously monitoring PM10 data and a gravametric  Partisol 2025i monitoring PM2.5. A meteorological station is located beside it measuring air temperature, relative humidity, wind speed and wind direction.

PM10 has been monitored at a number of different sites within the Tahunanui. The current monitoring site was established in 2006 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). Air quality in Tahunanui 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. In recent years most recorded exceedances of the Standards are caused by fine wind blown dust thought to be from roads and unpaved areas, especially in summer months.

Scientific Indicators
Scientific data for this site

This dashboard shows the latest results for air quality indicators collected by regional councils and unitary authorities.  Indicators are shown against the National Environmental Standards for Air Quality (NES-AQ).  Where no national standards exist for the air quality measurements shown, the data are compared against other guidelines (e.g. World Health Organization (WHO) 2021 guidelines, Ambient Air Quality Guidelines (AAQG)).  

Select 'Show more information +' under a dashboard to see the current and historical monitoring data.

 

  • PM10
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    • Exceedance
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    PM10 information

    • Hourly
    • Daily
    • Monthly
    • Annual
    • Exceedances
    • Show wind speed
    • Show temperature
    Months:
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    Showing:

    Guideline

    Concentration (µg/m3)

    Wind speed (km/h)

    Air temperature (℃)

    Guideline

    What is this graph showing me?

    This graph shows how concentrations of PM10 change on an hourly, daily, monthly or annual basis for the selected time period. The number of exceedance days can be viewed over the last 10 years or all years if available.

    The PM10 daily average concentrations and exceedance days are compared to the National Standard (NES-AQ), and the PM10 annual average concentrations are compared to the WHO guideline.  The standard and guideline limits are denoted by the red horizontal line.   There are no guidelines for hourly or monthly average concentrations.  For information about allowable exceedances and targets, and the limitations of data shown, see the factsheet on monitoring air quality in New Zealand. 

    The concentrations depend on local sources of emissions and weather conditions. Emissions from various sources change, depending on whether it's a weekday or the weekend or at different times of the year (e.g. emissions from home heating go up in the cold winter months).  Still conditions often lead to high concentrations, as there is no wind to blow away the pollutants in the air.  At some monitoring sites, the hourly temperature and wind data are available to explore the relationship between local weather conditions and PM10 concentrations.  See this factsheet about why air quality is important and factors that influence air quality. 

     Download data