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Daily Maximum Eight-Hour Ozone Averages for August 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in August 2019 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 2019POCMonitoring Site
1234567891011121314151617181920212223
Southwest
Rural Retreat1413846474352484548444444364450474647434245NVNA1Rural Retreat
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920212223
Valley
Albemarle High School1454843505149484443444346414348424645NV4742NVNA1Albemarle High School
Frederick Co. Public School Maint. Dept.1545446475155NV4444413351444350494946405344NVNA1Frederick Co. Public School Maint. Dept.
Natural Bridge Station1374143444148484942444544344344394240403643NVNA1Natural Bridge Station
Harrisonburg VDOT148504753475151464144444639NVNV395043424039NVNA1Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920212223
Blue Ridge
Herman L. Horn Elementary School1414548504654504946444844434647374645474248NVNA1Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920212223
Piedmont
Charles City County16142373638403852484545452954NV363335445233NVNA1Charles City County
Beach Road VDOT1474759404145444946495144405143483840484538NVNA1Beach Road VDOT
Hanover16047444449504851484443534341384338425749NVNVNA1Hanover
MSIC (MathScience Innovation Center)170505049545048545052504843504143506454NVNVNVNA1MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920212223
Tidewater
NASA Langley Research Center1604641454444414553475359355146453835474532NVNA1NASA Langley Research Center
Tidewater Community College1604539413637373848515555344339453434414029NVNA1Tidewater Community College
VA Tech Agricultural Research Center1464541423733384443485146363749343229373832NVNA1VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2019POCMonitoring Site
1234567891011121314151617181920212223
Northern
Aurora Hills Visitor Center164565957626353555148405745NVNV495047586241NVNA1Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1514242505142424746464148354344383935374432NVNA1Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1725252585956515550504452405452454642565837NVNA1Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1474841525340454744453846374244NVNANANV5032NVNA1Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School157605657NVNANANANANANANANANANANV4949477446NVNA1Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1525043544850494848474448414647434443494447NVNA1Shenandoah National Park - Big Meadows
Long Park - Haymarket1535650566053494846463649454951544744417043NVNA1Long Park - Haymarket
Widewater Elem. School - Widewater1524648555651485048484049385249434237435833NVNA1Widewater 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).
NA - Data not available.

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.