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Tristram Street

The Tristram Street site was established in December 2006 as a traffic monitoring site. Benzene is the main indicator measured.

The Tristram Street site is on the intersection of Tristram and London streets. Since December 2006, benzene, ethyl-benzene, toluene and xylenes (BTEX) have been monitored on a 3 monthly basis using passive 3M desorption badges

Scientific Indicators
Scientific data for this site

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

  • Benzene
    • Hourly average
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    • Daily average
      No Data
    • Monthly average
      No Data
    • Annual average
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    What do the dashboard colours mean for benzene?

    The dashboard colours show how benzene levels sit in relation to the guideline - from green (less than 10%) to red (over the guideline).  The guideline for annual average benzene is 3.6 µg/m3.  There are no guidelines for hourly, daily, or monthly data for benzene (charcoal colour) and generally monitoring is for a three month period to get an annual average.

    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

    Benzene information

    • Hourly
    • Daily
    • Monthly
    • Annual
    • 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 benzene change on a hourly, daily, monthly or an 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 benzene concentrations are shown against the guidelines for air quality (annual averages), and where concentrations exceed 100% of the guideline (red line) this can be a cause for concern, especially if this occurs on a frequent basis. 

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