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Peak Daily One-Hour Ozone Averages for June 2019

The table below lists the peak daily one-hour ozone concentrations measured in June 2019 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 2019POCMonitoring Site
Rural Retreat1516251514948394632404349464553483833345345433337431Rural Retreat
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Albemarle High School1505046504252454936324145474455433736314847384339461Albemarle High School
Frederick Co. Public School Maint. Dept.1584140505152506545283655424149434128394543395049451Frederick Co. Public School Maint. Dept.
Natural Bridge Station1555146534152344137243844454351412932204746364039391Natural Bridge Station
Harrisonburg VDOT1584443525257475438324144484558504335415146384840471Harrisonburg VDOT
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1545548525057485240324244494753433539265146454044421Herman L. Horn Elementary School
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Charles City County1674849524854474435284646423850464838294345416344461Charles City County
Beach Road VDOT1595048494956465335314243393652463837264345384238441Beach Road VDOT
MSIC (MathScience Innovation Center)1554748595157545440334746463954495445324846425944471MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCJune 2019POCMonitoring Site
NASA Langley Research Center1586151515459505842345046494454484539405046434750521NASA Langley Research Center
Tidewater Community College1605453525160475738285043464451484437284447435145471Tidewater Community College
VA Tech Agricultural Research Center1595952565553445234294446473853504437284439NANA46451VA Tech Agricultural Research Center
AreaMonitoring SitePOCJune 2019POCMonitoring Site
Aurora Hills Visitor Center1796044575060586041344246464356507045464946455259531Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1594844484646445238304342453750434333304544424445441Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1755346534964595941334245414253446035394847455046541Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1534141454051415041263743363848423729254442404536401Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1604844485059636142314151464354465536455048434459511Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1545344566258595944424247504657554735364949484335481Shenandoah National Park - Big Meadows
Long Park - Haymarket1574844484961656442314049444253465834344547444553501Long Park - Haymarket
Widewater Elem. School - Widewater1674945454457465340364344394048414233384545454347451Widewater Elem. School - Widewater
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.