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Billah Street

The Billah Street site was established in March 2001. PM10 is the main indicator measured, along with meteorological data.

The Billah Street site at the Billah Street Reserve is the main residential PM10 monitoring station for Tokoroa. A MET ONE series 1020 BAM was used to monitor PM10 from 2001 to 2005. In September 2005 the MET ONE instrument was replaced with an FH62 BAM due to unacceptable data loss caused by frequent tape failure from the MET ONE. It was also identified that the baseline PM10 concentration over the period 2003 to September 2005 was anomalously elevated. Only PM10 data collected using the FH62 BAM from September 2005 onwards is provided. Daily PM10 data collected prior to September 2005 is available from Waikato Regional Council on request. The PM10 data since September 2005 is gravimetrically adjusted based on co-located sequential partisol monitoring. In April 2015 the PM10 monitoring equipment was shifted 25m on site to a new location to avoid potential impacts from a lime dosing operation to treat the municipal water supply. In addition to PM10 monitoring, PM2.5 has been measured since July 2015 using a 5014i BAM.



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