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|2017 Sorted by Maximum Value|
|Location||Region||CAMS||AQS||Date||Time||Value||POC||No values meet or exceed 71 ppb for 2017|
|No sites report 8-hour ozone concentrations meeting or exceeding 71 parts per billion for 2017.|
|POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.|
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's AirNow web site.
Place your mouse pointer over the scale displayed above to view information about the Air Quality Index, and each of the rating levels.
The actual index calculation is different for each parameter measured and is specified by the EPA. The following table shows the various breakpoints used in calculating the AQI.
|AQI Breakpoint Definitions|
|AQI Range||1hr Ozone
|0 - 50||Not Defined||0 - 0.054|
|51 - 100||Not Defined||0.055 - 0.070|
|101 - 150||0.125 - 0.164||0.071 - 0.085|
|151 - 200||0.165 - 0.204||0.086 - 0.105|
|201 - 300||0.205 - 0.404||0.106 - 0.200|
|301 - 400||0.405 - 0.504||Not Defined|
|401 - 500||0.505 - 0.604||Not Defined|
|500+||Not Defined||Not Defined|
PLEASE NOTE: This data has not been verified by the Virginia DEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from Virginia DEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.