This dashboard shows information on the data collected by the regional councils for air quality scientific indicators:
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Nitrogen dioxide
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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 informationWhat do the dashboard colours mean for nitrogen dioxide?
The dashboard colours show how nitrogen dioxide levels sit in relation to these guidelines – from green (less than 10%) to red (over the guideline). The guideline (100% value) for the hourly average is 200 µg/m3, for the daily average 100 µg/m3, and 40 µg/m3 for the annual average. There are no guidelines for 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 Nitrogen dioxide 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 nitrogen dioxide change on an hourly, daily, monthly or annual basis for the selected time period. 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 nitrogen dioxide concentrations are shown against the guidelines for air quality (for hourly, daily and 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.
Exceedance data (when available) shows the number of hours 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.
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Carbon monoxide
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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 informationWhat 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
Months:-Showing:Guideline
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.
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