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Daily Maximum Eight-Hour Ozone Averages for June 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in June 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 SitePOCJune 2018POCMonitoring Site
Rural Retreat1485251565356585655534532425454574947463427311Rural Retreat
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Albemarle High School1453326475042474943422840294959594650443434431Albemarle High School
Frederick Co. Public School Maint. Dept.1413119355034485456272640324745565050403734321Frederick Co. Public School Maint. Dept.
Natural Bridge Station1383130504947465345392932254748504738423534251Natural Bridge Station
Harrisonburg VDOT1463220455337495653402437304857634953433635401Harrisonburg VDOT
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School14636425453474760NV46333332516061564646NV34241Herman L. Horn Elementary School
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Charles City County1515031465045495250453435375951554672504338311Charles City County
Beach Road VDOT1383928434647494444422834385251483251443235241Beach Road VDOT
MSIC (MathScience Innovation Center)1513734485144575350503437405454625267495641321MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCJune 2018POCMonitoring Site
NASA Langley Research Center1395436425147415448544739365853576050634946471NASA Langley Research Center
Tidewater Community College1394331425050405544524639375453635347575444341Tidewater Community College
VA Tech Agricultural Research Center1474137475156455048434336415450534952534439281VA Tech Agricultural Research Center
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Aurora Hills Visitor Center1584738415339545864463342405152666070474846411Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1444129394741464745392832305151604353433842431Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1554437435241505162413137345251615057474647411Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1333220324637403743312334234547524343383135411Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1524723425236495560443442355246586153445342351Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1494837475646485554514541425256585252503644461Shenandoah National Park - Big Meadows
Long Park - Haymarket1464725435138495156412840334749575249434138381Long Park - Haymarket
Widewater Elem. School - Widewater1394733364843454757402833304952584254444244411Widewater 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.