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Peak Daily One-Hour Ozone Averages for June 2018

The table below lists the peak daily one-hour ozone concentrations measured in June 2018 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 2018POCMonitoring Site
Rural Retreat15153565856586160615848344959576151504937291Rural Retreat
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Albemarle High School14936295053474953524831443153626549554644401Albemarle High School
Frederick Co. Public School Maint. Dept.14837213952395365613730423653485957574444391Frederick Co. Public School Maint. Dept.
Natural Bridge Station14036375254495359544331343355515652444439381Natural Bridge Station
Harrisonburg VDOT15039264755395462604629403749626654604642421Harrisonburg VDOT
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School14943465557524963675435383754666560534740381Herman L. Horn Elementary School
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Charles City County16464445152475257575138384070566151865452451Charles City County
Beach Road VDOT14144375149515946504633404456565136554736411Beach Road VDOT
MSIC (MathScience Innovation Center)15843445253496759536137414461607468745278461MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCJune 2018POCMonitoring Site
NASA Langley Research Center14669425153524657526150443862556666566553511NASA Langley Research Center
Tidewater Community College14246375052524368496049454058557366577066511Tidewater Community College
VA Tech Agricultural Research Center15046425354634954534647404858525654546048461VA Tech Agricultural Research Center
AreaMonitoring SitePOCJune 2018POCMonitoring Site
Aurora Hills Visitor Center16259524556466065774941454955577368805364511Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory15044434650454953504436353453546451624948471Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County16161514756475557744443404055566554675454511Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area13838283952394442533632362648505949514339381Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School15552464555455160644739453857486165574964441Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows15154485157575159566149464152586156555239391Shenandoah National Park - Big Meadows
Long Park - Haymarket15053454755505154604541423551526061524654431Long Park - Haymarket
Widewater Elem. School - Widewater14558454655495155644438353452546047684853501Widewater 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.