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Daily Maximum Eight-Hour Ozone Averages for December 2018

The table below lists the peak daily maximum eight-hour ozone concentrations measured in December 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 SitePOCDecember 2018
1234567891011
Southwest
Rural Retreat135373521273227303137NA
AreaMonitoring SitePOCDecember 2018
1234567891011
Valley
Albemarle High School112233527232829282230NA
Frederick Co. Public School Maint. Dept.110112527222427272027NA
Natural Bridge Station121263617263133272733NA
Harrisonburg VDOT13223221262829271712NA
AreaMonitoring SitePOCDecember 2018
1234567891011
Blue Ridge
Herman L. Horn Elementary School115293515262830262933NA
AreaMonitoring SitePOCDecember 2018
1234567891011
Piedmont
Charles City County11212242522252627NVNANA
Beach Road VDOT112162624252524271923NA
Hanover111142826232426272225NA
MSIC (MathScience Innovation Center)111132326202424262225NA
AreaMonitoring SitePOCDecember 2018
1234567891011
Tidewater
NASA Langley Research Center129293226232525292727NA
Tidewater Community College132302723212325282923NA
VA Tech Agricultural Research Center133313122222526273024NA
AreaMonitoring SitePOCDecember 2018
1234567891011
Northern
Aurora Hills Visitor Center1392525222426271522NA
Fredericksburg Geomagnetic Observatory17133429202932272026NA
Lee District Park - Fairfax County1NV926262227292915NVNA
Sumerduck - C. Phelps Wildlife Mgmt Area16153326252932282028NA
Ashburn - Broad Run High School15122727242729281826NA
Shenandoah National Park - Big Meadows133343532303337374441NA
Long Park - Haymarket1792929262730312227NA
Widewater Elem. School - Widewater1483127242731291827NA
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).
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.