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Nelson at St Vincent St

Nelson South comprises mainly residental use within a central valley. The valley results in conditions which trap pollutants during winter months. It has one PM10 monitoring site.

Nelson South has one PM10 monitoring station established in 2000. Historically the Nelson South area has suffered from the highest PM10 concentrations within Nelson City. The monitoring site has a real time PM10 monitor (Thermo FH62) along with a cross check monitor (Partisol 2000). PM2.5 has been monitored at this site for 1 day in 6 since July 2008, increasing to 1 day in 3 since November 2015. A meteorological monitoring site is also located approximately 750 metres to the south within the valley and a further meterolgical monitoring site is located on the crest of the Port Hills approximately 1500 metres to the west. PM10 levels in Nelson South have decreased dramatically since monitoring began in 2000. Nelson South is now close to complying with the requirements of the National Environmental Standards for air quality. During 2015 only one exceedance of the National Environmental Standards occurred.

Scientific Indicators
Scientific data for this site

This dashboard shows information on the data collected by the regional councils for air quality scientific indicators:

  • PM10
    • Hourly average
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    • Daily average
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    • Monthly average
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    • Annual average
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    Show more information Hide information

    What do the dashboard colours mean for PM10?

    The dashboard colours show how PM10 levels sit in relation to the guideline – from green (less than 10%) to red (more than 100% of the guideline).  The guideline (100%) value for the daily average PM10 is 50 µg/m3 and  20 µg/m3  for the annual average.  There are no guidelines for hourly or monthly data (charcoal colour).  

    Colour Percent of guidelines
    Less than 10% of guideline
    10-33% of guideline
    33-66% of guideline
    66-100% of guideline
    Greater than 100% of guideline
    No guideline

    PM10 information

    • Hourly
    • Daily
    • Monthly
    • Annual
    • Exceedances
    • Show wind speed
    • Show temperature


    Concentration (µg/m3)

    Wind speed (km/h)

    Air temperature (℃)

    What is this graph showing me?

    This graph shows how levels of PM10 change on an hourly, daily, monthly or annual basis for the selected time period. The levels depend on local sources of emissions and what the weather is doing.  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 goes 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.   The PM10 concentrations are shown against the guidelines for air quality (for daily and annual averages), and where concentrations exceed the guideline (red line) this can be a cause for concern, especially if this occurs on a frequent basis. 

    Exceedance data (when available) shows the number of days per year that the concentrations went above 100% of the air quality guideline.  

    For information about allowable exceedances and targets, and the limitations of data shown, see the Factsheet on monitoring air quality in New Zealand