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Daily Maximum Eight-Hour Ozone Averages for August 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 2018 in each community where the Virginia DEQ measures ozone. Concentrations that are rated Moderate or higher are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion.

Use the selection boxes below to customize this report. You may select a different month, a different year, a different report format, and whether or not to include time on the report. Click on the Generate Report button once you have made your selections.

Month:Year:Report Format: Include time:
Include time
Highlight with AQI colors
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Rural Retreat135302941404638374642434142454734341Rural Retreat
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Albemarle High School138222240394837374051363842384444271Albemarle High School
Frederick Co. Public School Maint. Dept.137272240414232344248323032343852251Frederick Co. Public School Maint. Dept.
Natural Bridge Station131171934333330294043333231333032211Natural Bridge Station
Harrisonburg VDOT137262346475535334556393731354639291Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School135282451484039374657483542445248301Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Charles City County131171530413443354656443735404745341Charles City County
Beach Road VDOT12817172933323131384927453436NV44271Beach Road VDOT
MSIC (MathScience Innovation Center)132192039474941394255523945425658411MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
NASA Langley Research Center124162133474745384453444436404551361NASA Langley Research Center
Tidewater Community College120111824444342374654424433383539291Tidewater Community College
VA Tech Agricultural Research Center121131828323437373842363932344247251VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Aurora Hills Visitor Center138222450556555525165484247435357421Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory131201935344834394151384042374537301Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County134212044485552475161464548415249361Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area131151333334027273642273132333531241Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School140232546495843435054443541415053381Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1383033484850NV394950444144404744411Shenandoah National Park - Big Meadows
Long Park - Haymarket137212243424738384549383036374746331Long Park - Haymarket
Widewater Elem. School - Widewater1NV171733384444374552364442374443311Widewater Elem. School - Widewater
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
NV - There are not enough valid eight-hour averages for this day (there must be eighteen valid eight-hour averages).

Interpreting the AQI

Air Quality Index

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
in ppm
8hr Ozone
in ppm
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.