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Daily Maximum Eight-Hour Ozone Averages for June 2019

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 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 SitePOCJune 2019POCMonitoring Site
Rural Retreat147564846474441393036414744435247343031494341313341NA1Rural Retreat
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Albemarle High School147454446374841443329394344385239343126464437413543NA1Albemarle High School
Frederick Co. Public School Maint. Dept.152373746414944613823334839354739332633383937463942NA1Frederick Co. Public School Maint. Dept.
Natural Bridge Station1484844493748303728223641414148392529NV434429362937NA1Natural Bridge Station
Harrisonburg VDOT153394049445344513328394346395346383234474336453646NA1Harrisonburg VDOT
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School14952455045524747363339NV45405142303523484541383640NA1Herman L. Horn Elementary School
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Charles City County154444749425043403127424338364844423627NV4339484041NA1Charles City County
Beach Road VDOT153464646444842413129393834345043363323414335393439NA1Beach Road VDOT
MSIC (MathScience Innovation Center)149434654475148443529424340375347474030464440474144NA1MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCJune 2019POCMonitoring Site
NASA Langley Research Center152554648505553563629454340415145423530434340454549NA1NASA Langley Research Center
Tidewater Community College1535046494848465331254640394049NV403324404340474342NA1Tidewater Community College
VA Tech Agricultural Research Center15356485050503949292741434136514741332540NVNANANV39NA1VA Tech Agricultural Research Center
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Aurora Hills Visitor Center169544351485754563826404440385247543939444442464949NA1Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory153424345414240483225403937354842372627424139393839NA1Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County171494449446155553925414336394941483132434342443950NA1Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area147373843384535473121354132344537312522403936393136NA1Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School156474246465659583727394742395044503438454439414749NA1Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows149494359595655564035404546445448413433474343NANV47NA1Shenandoah National Park - Big Meadows
Long Park - Haymarket153464246465757603829394742375044463131414441424147NA1Long Park - Haymarket
Widewater Elem. School - Widewater159414243425443503726404134364640392729404242383941NA1Widewater 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.