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North roundabout, Stratford

The rural Stratford site was located at north roundabout along SH 3, close to commercial shops and a petrol station. The site is approximately 275 m above sea level.

The monitoring site represents a rural town area and to assess the traffic condition for carbon monoxide (CO) level. Monitoring for carbon monoxide was conducted over two periods (October - November 2002 and February 2003) using HOBO CO logger.

Scientific Indicators
Scientific data for this site

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

  • Carbon monoxide
    • 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 carbon monoxide?

    The dashboard colours show how carbon monoxide levels sit in relation to the guideline – from green (less than 10%) to red (over the guideline).  The guideline (100% value) for the hourly average carbon monoxide is 30 mg/m3.  There are no guidelines for daily, monthly or annual 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

    Carbon monoxide information

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


    Concentration (mg/m3)

    Wind speed (km/h)

    Air temperature (℃)

    What is this graph showing me?

    This graph shows how levels of carbon monoxide 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 carbon monoxide concentrations are shown against the guidelines for air quality (hourly), 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 allowable exceedances and targets, and the limitations of data shown, see the Factsheet on monitoring air quality in New Zealand