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Lower Hutt (Phil Evans Reserve)

The Central Lower Hutt air quality site is located on the eastern side of the Hutt River, in Phil Evans Reserve near the Waterloo train station. The site was established in 2001 and measures the quality indicator PM10.

⚠️ Air quality data from Greater Wellington monitoring sites are currently unable to be displayed on LAWA due to a data server issue.  In the meantime, please see https://graphs.gw.govt.nz/ for air quality data.

This site primarily measures the impacts of residential, traffic and commercial emissions on air quality. PM10 levels measured at this site meet national standards and guidelines. Between 2002 and 2011 there was an overall trend of improving air quality. Since 2012 there has been little change in PM10 levels.  Nitrogen dioxide and carbon monoxide were measured at this site until 2011 and levels of these pollutants easily met national standards and guidelines.

 

 

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 Data verified to 31/12/2021
    • Hourly average
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    • Daily average
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    • Monthly average
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    • Annual average
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    • Exceedance
      2023
      Year to date
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      Exceedance
      2023
      Year to date
      No Data
    Show more information Hide information

    What do the dashboard colours mean for PM10?

    The dashboard colours show how PM10 levels sit in relation to guidelines – from dark blue (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). 

    If a site has less than two days of PM10 exceedances each year, this is compliant with the NES-AQ.  If there are two or more exceedances annually, then the site does not comply with the NES-AQ.

    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
    Colour Number of exceedances permitted
    Compliant
    Non-compliant

    PM10 information

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

    Guideline

    Concentration (µg/m3)

    Wind speed (km/h)

    Air temperature (℃)

    Guideline

    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 50 µg/m3.  

    The World Health Organization published new guidelines in September 2021 of 45 µg/m3 for daily averages and 15 µg/m3 for annual averages.

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

     Download data