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Peak Daily One-Hour Ozone Averages for August 2018

The table below lists the peak daily one-hour ozone concentrations measured in August 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 SitePOCAugust 2018POCMonitoring Site
Rural Retreat1373235444350424250464844444851381Rural Retreat
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Albemarle High School1412628464353474242564143544449491Albemarle High School
Frederick Co. Public School Maint. Dept.1413226454652383945554139413841631Frederick Co. Public School Maint. Dept.
Natural Bridge Station1362224413842333343474042404034381Natural Bridge Station
Harrisonburg VDOT1412928525160444249634541424053491Harrisonburg VDOT
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Blue Ridge
Herman L. Horn Elementary School1403226615345444248635638484960601Herman L. Horn Elementary School
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Charles City County1362319365050484054686040395165541Charles City County
Beach Road VDOT1312119353835343442574054373844531Beach Road VDOT
MSIC (MathScience Innovation Center)1352323416260464147606442504872701MSIC (MathScience Innovation Center)
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
NASA Langley Research Center1282323415253494047636048384349581NASA Langley Research Center
Tidewater Community College1231921275066474152734850364242431Tidewater Community College
VA Tech Agricultural Research Center1231720313938414344494545353845521VA Tech Agricultural Research Center
AreaMonitoring SitePOCAugust 2018POCMonitoring Site
Aurora Hills Visitor Center1422828556273705654725650604758621Aurora Hills Visitor Center
Fredericksburg Geomagnetic Observatory1332823383755404845594443474150391Fredericksburg Geomagnetic Observatory
Lee District Park - Fairfax County1372525475665615354685354574457561Lee District Park - Fairfax County
Sumerduck - C. Phelps Wildlife Mgmt Area1342316383648353840493839433743361Sumerduck - C. Phelps Wildlife Mgmt Area
Ashburn - Broad Run High School1422628495363534753574941474452581Ashburn - Broad Run High School
Shenandoah National Park - Big Meadows1443433515152434051554845494250461Shenandoah National Park - Big Meadows
Long Park - Haymarket1392527474655504349514442424150521Long Park - Haymarket
Widewater Elem. School - Widewater1342120374352554248594054464048521Widewater 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.