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Cromwell

The monitoring site for Cromwell was installed in 2008 at the polytech in the old part of town. It is active from April to September each year.

Targeted monitoring shows that the older, central part of town experiences the worst air quality during the evenings.

 

Cromwell has some of the worst air quality in Otago. Results indicate air quality does not meet the National Environmental Standard for PM10 in excess of 40 days each year.

Domestic heating combined with cold and calm weather during winter is a major cause of air quality degradation. Cromwell has experienced rapid population growth in recent years, with a resultant increase in wood burners.

 

 

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
    Months:
    -
    Showing:

    Guideline


    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