X157 Data by Site by Date (all parameters)

Use this form to retrieve hourly data collected at Denton Airport South C56/A163/X157. Although this is the most current data, it is not considered official until it has been certified by the technical staff. This information is updated hourly.

This web page provides the most current hourly averaged data available. Our convention for time-tagging data is the beginning of each hour. For example, values shown for the noon hour are based on measurements taken from noon to 1:00 p.m. The noon average will not be calculated until after 1:00 p.m. The noon average will then be available on our external server from 1:15 p.m. to 1:30 p.m. This results in an apparent one-hour time lag in the data. We also present our data in Local Standard Time for each measuring site. For most of Texas this is Central Standard Time. During Daylight Savings, this introduces another apparent one-hour time lag in the data.

Use the controls below to select a different date or time format. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.

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Month:	Day:	Year:	Time Format:

Green underline for validated data

The table below contains hourly averages for all the pollutants and meteorological conditions measured at Denton Airport South C56/A163/X157 for Friday, April 24, 2009. All times shown are in CST.

Parameter Measured	0000	0100	0200	0300	0400	0500	0600	0700	0800	0900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300	Parameter Measured	POC
NOy	2.1	2.2	2.1	2.1	2.0	2.8	6.6	9.1	6.5	7.0	5.0	4.2	5.1	5.0	5.7	3.3	3.2	3.2	2.9	3.1	3.5	3.7	4.3	4.0	NOy	2 ^MDL
Nitric Oxide	0.1	0.0	0.1	0.1	0.0	0.2	0.8	1.9	1.1	1.4	0.9	0.6	0.8	0.4	0.8	0.3	0.0	0.2	0.1	0.1	0.0	0.0	0.0	0.1	Nitric Oxide	1 ^MDL
Nitric Oxide	0.1	0.1	0.1	0.1	0.1	0.2	1.1	2.2	1.5	2.0	1.2	1.0	1.1	0.9	1.3	0.5	0.4	0.3	0.2	0.1	0.1	0.1	0.1	0.1	Nitric Oxide	2 ^MDL
Nitrogen Dioxide	0.0	0.0	0.0	0.0	0.0	0.3	3.8	5.8	3.7	3.8	2.4	1.6	2.4	2.3	3.0	0.7	0.3	0.3	0.3	0.5	0.9	1.3	2.1	1.9	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	0.0	0.0	0.0	0.0	0.0	0.5	4.6	7.7	4.8	5.2	3.2	2.2	3.2	2.8	3.8	0.9	0.4	0.4	0.4	0.6	0.9	1.3	2.1	2.0	Oxides of Nitrogen	1 ^MDL
Ozone	35	33	33	34	35	35	31	28	32	36	41	44	46	48	48	49	50	50	47	46	44	41	37	35	Ozone	1 ^R ^MDL
Wind Speed	11.7	11.8	11.1	9.6	9.3	11.6	11.5	10.7	12.2	13.2	12.8	14.3	14.2	14.4	15.5	16.6	16.7	15.7	13.1	12.3	11.0	9.1	7.8	9.4	Wind Speed	1
Resultant Wind Speed	11.1	11.2	10.5	9.1	8.8	10.9	10.9	10.1	11.5	12.5	12.0	13.5	13.4	13.7	14.7	15.9	16.0	14.9	12.5	11.7	10.5	8.7	7.4	8.9	Resultant Wind Speed	1
Resultant Wind Direction	170	167	167	167	171	188	183	163	166	171	171	177	176	177	178	182	182	173	165	162	165	163	163	161	Resultant Wind Direction	1
Maximum Wind Gust	22.8	22.9	24.0	21.0	19.7	29.4	24.5	23.0	26.9	27.5	26.0	28.2	28.6	29.3	32.8	33.7	32.3	33.1	27.2	24.4	23.8	21.1	16.6	19.2	Maximum Wind Gust	1
Std. Dev. Wind Direction	18	18	19	18	19	19	19	18	19	19	19	19	19	18	18	17	16	17	18	18	17	18	18	18	Std. Dev. Wind Direction	1
Outdoor Temperature	69.8	68.7	68.1	67.7	67.8	68.6	69.4	69.7	71.3	73.9	76.0	77.9	79.0	80.3	81.9	82.7	81.7	80.1	77.4	75.4	74.0	72.2	70.7	70.1	Outdoor Temperature	1
Dew Point Temperature	59.5	59.8	60.0	60.1	60.8	61.5	61.7	62.5	62.7	62.5	62.4	61.8	62.3	62.5	63.0	62.2	60.0	59.8	61.7	61.9	59.6	59.3	60.4	61.2	Dew Point Temperature	1
Relative Humidity	70.2	73.6	75.6	77.0	78.4	78.3	76.7	78.1	74.4	67.7	62.8	57.7	56.6	54.8	52.8	50.0	47.8	50.3	58.8	63.0	61.0	64.1	70.2	73.5	Relative Humidity	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.001	0.101	0.105	0.358	0.512	0.700	0.862	0.965	0.814	0.895	0.803	0.533	0.281	0.066	0.002	0.000	0.000	0.000	0.000	Solar Radiation	1
Precipitation	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	Precipitation	1
PM-2.5 (Local Conditions) Acceptable	10.8	10.8	10.8	11.1	14.5	20.1	18.3	23.9	26.7	32.6	27.0	31.6	32.3	34.0	36.8	37.4	20.4	20.7	18.8	14.3	7.5	8.9	9.8	11.8	PM-2.5 (Local Conditions) Acceptable	3 ^MDL
Parameter Measured	0000	0100	0200	0300	0400	0500	0600	0700	0800	0900	1000	1100	1200	1300	1400	1500	1600	1700	1800	1900	2000	2100	2200	2300	Parameter Measured	POC
	Maximum values for each parameter are bold within the table. Minimum values are *bold italic*.
	^R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE: This data has not been verified by the TCEQ 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 TCEQ 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.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.

Texas Commission on Environmental Quality

Denton Airport South C56/A163/X157 Data by Site by Date (all parameters)