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Eight-Hour Ozone High Value Days for 2019
as of October 18

The table below lists the daily maximum eight-hour ozone concentrations measured which meet or exceed 76 parts per billion in 2019 in each community where the TREX measures ozone. This information is updated hourly. Concentrations are color-highlighted based on the EPA-defined Air Quality Index colors. (See Interpreting the AQI.) Times shown are in 24-hour format and are Local Standard Time. Our convention is that the time reflects the beginning of the eight-hour average. All ozone measurements are in parts per billion.

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YearSort ByReport Format
Highlight with AQI colors
2019 Sorted by Maximum Value
LocationRegionCAMSAQSDateTimeValuePOC
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 1 201902:001561 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 30 201923:001551 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 14 201903:001551 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 2 201901:001541 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 3 201901:001541 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 16 201902:001541 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 5 201901:001531 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 6 201901:001531 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 7 201903:001531 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 11 201902:001531 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 15 201901:001531 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 4 201913:001521 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 29 201922:001521 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 4 201923:001521 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 10 201905:001521 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 18 201904:001521 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 3 201910:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 5 201912:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 6 201909:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 7 201908:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 8 201909:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 9 201913:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 29 201913:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 30 201908:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 31 201918:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 3 201911:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 20 201901:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 21 201901:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 25 201912:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 28 201920:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 8 201904:001511 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 2 201910:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 11 201915:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 12 201915:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 13 201912:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 14 201907:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 15 201908:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 17 201913:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 19 201909:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 21 201915:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 22 201915:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 25 201912:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 26 201916:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 27 201914:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 28 201902:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 1 201912:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 2 201908:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 4 201902:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 6 201918:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 7 201911:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 8 201905:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 10 201912:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 13 201909:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 15 201908:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 17 201903:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 19 201913:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 24 201922:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 17 201911:001501 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 10 201906:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 16 201903:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 18 201906:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 20 201901:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 23 201909:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 24 201911:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 5 201901:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 9 201908:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 11 201908:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 12 201906:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 14 201907:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 16 201907:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 18 201901:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 22 201903:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 26 201904:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 27 201912:001491 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000September 23 201901:001481 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 9 201901:001481 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 12 201902:001481 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000October 13 201923:001461 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 26 201913:001351 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 30 201913:001351 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 13 201913:001341 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 21 201915:001341 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 29 201910:001341 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 1 201913:001341 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 28 201911:001341 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 11 201906:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 12 201913:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 20 201912:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 30 201908:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 2 201907:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 11 201912:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 12 201913:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 19 201914:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 22 201909:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 24 201913:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 27 201908:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 29 201907:001331 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 26 201909:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 27 201913:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 7 201909:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 8 201910:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 10 201909:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 13 201906:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 15 201910:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 16 201907:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 20 201914:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 21 201917:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 23 201903:001321 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 16 201910:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 18 201913:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 19 201909:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 24 201915:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 25 201907:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 28 201913:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 4 201911:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 5 201906:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 18 201909:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000August 1 201909:001311 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 10 201913:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 14 201910:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 15 201906:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 17 201910:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 9 201911:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 14 201908:001301 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 23 201906:001291 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 25 201916:001291 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 31 201907:001291 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 22 201904:001281 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 3 201909:001281 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 6 201907:001281 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 4 201911:001261 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 8 201913:001261 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000July 17 201906:001261 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 6 201912:001231 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 5 201901:001211 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 7 201913:001211 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000June 9 201913:001211 N
Las Vegas Paiute Air Monitoring Site-NV 9 800032_003_8000February 6 201913:00781 N
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.

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 - 0.059
51 - 100 Not Defined 0.06 - 0.075
101 - 150 0.125 - 0.164 0.076 - 0.095
151 - 200 0.165 - 0.204 0.096 - 0.115
201 - 300 0.205 - 0.404 0.116 - 0.374
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 TREX 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 TREX 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.