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Peak Daily One-Hour Ozone Averages for June 2017

The table below lists the peak daily one-hour ozone concentrations measured in June 2017 in each community where the Virginia DEQ measures ozone. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) All ozone measurements are in parts per billion, and are truncated to an integer number.

The values that go into this table are calculated at 3:30 am each morning. Therefore, the current day will almost always have very low hourly averages that are not truly representative of local conditions for the day. Because of this, the report does not display the current day's data.

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 using AQI colors
AreaMonitoring SitePOCJune 2017POCMonitoring Site
Rural Retreat15459645546574446525955484144514139423751553226464547481Rural Retreat
AreaMonitoring SitePOCJune 2017POCMonitoring Site
Albemarle High School15358636146483950505653534855624239413147564926434449461Albemarle High School
Frederick Co. Public School Maint. Dept.15350525956382953546051515363584544433650575127474648441Frederick Co. Public School Maint. Dept.
Natural Bridge Station15159625642463541515854464149363535393142504326434444461Natural Bridge Station
Harrisonburg VDOT15647645846453944536055576060534947443051545425474548441Harrisonburg VDOT
AreaMonitoring SitePOCJune 2017POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School15560665942463941515955594956493840403151545324434448471Herman L. Horn Elementary School
AreaMonitoring SitePOCJune 2017POCMonitoring Site
Charles City County16068585935533646496059725635485633333239445424394961611Charles City County
Beach Road VDOT15659575836483743475852624564694728323233463824404148521Beach Road VDOT
MSIC (MathScience Innovation Center)15965596238523647515959796864566935333648505930435260581MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCJune 2017POCMonitoring Site
NASA Langley Research Center16470616742564946595559535679527231352941394526415059511NASA Langley Research Center
Tidewater Community College15771626235545047555658545159516123332541384026395464551Tidewater Community College
VA Tech Agricultural Research Center15973606237613942485555525462614525342638373226395552551VA Tech Agricultural Research Center
AreaMonitoring SitePOCJune 2017POCMonitoring Site
Aurora Hills Visitor Center16163616758443656586862687378586445433858626229525254511Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory15560586241463854535355615873564335373346454225464651501Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County15960596150443957566261686381534737383452565623504951501Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area15055555242413657495849474657514031392844473725444348431Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School16062576160443562596457526180715443453855645327525151491Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows15759616051553850535954514761544647433548525031494948441Shenandoah National Park - Big Meadows
Long Park - Haymarket15760596253453964546357545871634845453754585026495053481Long Park - Haymarket
Widewater Elem. School - Widewater15561585741453757525353555274544838393450464823474753481Widewater Elem. School - Widewater

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.