IDEM Continuous Air Quality Monitoring

Eight-Hour Ozone High Value Days for 2009
The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 75 parts per billion in 2009 in each community where IDEM measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.

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Year	Sort By	Report Format

Highlight with AQI colors

2009 Sorted by Maximum Value
Location	Region	CAMS	AQS	Date	Time	Value	POC
No values exceed 75 ppb for 2009
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.

Interpreting the AQI

Each NAAQS pollutant has a separate AQI scale, with an AQI rating of 100 corresponding to the concentration of the Federal Standard for that pollutant. Additional information about the AQI and how it can be used is available from the EPA Exit

The AQI scale is divided into the following categories:

Air Quality
	Good	Moderate	Unhealthy (for sensitive groups)	Unhealthy	Very Unhealthy	Hazardous
The AQI Air Quality Scale