Daily Maximum Eight-Hour Ozone Averages for December 2008

The table below lists the peak daily maximum eight-hour ozone concentrations measured in December 2008 in each community where the DAQEM 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

Area	Monitoring Site	POC	December 2008
Area	Monitoring Site	POC	1	2	3
Clark County
	E. Craig Road	1	12	10	15
	Apex	1	23	34	35
	Mesquite	1	20	17	24
	Paul Meyer	1	17	10	18
	Walter Johnson	1	17	28	27
	Lone Mountain	1	13	36	30
	Palo Verde	1	21	27	26
	Joe Neal	1	20	36	34
	Winterwood	1	15	6	14
	Boulder City	1	25	39	40
	Jean	1	26	30	33
	Orr	1	14	23	24
	JD Smith	1	11	19	18
POC (Parameter Occurrence Code): a code used to correctly separate data from multiple instruments at one site.

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 Exit

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	8hr Carbon Monoxide in ppm	24hr Sulfur Dioxide in ppm	24hr PM-10 in ug/m3	24hr PM-2.5 in ug/m3
0 - 50	Not Defined	0 - 0.059	0 - 4.4	0 - 0.034	0 - 54	0 - 15.4
51 - 100	Not Defined	0.06 - 0.075	4.5 - 9.4	0.035 - 0.144	55 - 154	15.5 - 40.4
101 - 150	0.125 - 0.164	0.076 - 0.095	9.5 - 12.4	0.145 - 0.224	155 - 254	40.5 - 65.4
151 - 200	0.165 - 0.204	0.096 - 0.115	12.5 - 15.4	0.225 - 0.304	255 - 354	65.5 - 150.4
201 - 300	0.205 - 0.404	0.116 - 0.374	15.5 - 30.4	0.305 - 0.604	355 - 424	150.5 - 250.4
301 - 400	0.405 - 0.504	Not Defined	30.5 - 40.4	0.605 - 0.804	425 - 504	250.5 - 350.4
401 - 500	0.505 - 0.604	Not Defined	40.5 - 50.4	0.805 - 1.004	505 - 604	350.5 - 500.4
500	Not Defined	Not Defined	Not Defined	Not Defined	605 - 4999	500.5 - 999.9