X159 Data by Site by Date (all parameters)

Use this form to retrieve hourly data collected at Ascarate Park SE C37/A332/A172/X159. 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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Green underline for validated data

The table below contains hourly averages for all the pollutants and meteorological conditions measured at Ascarate Park SE C37/A332/A172/X159 for Wednesday, December 10, 2025. All times shown are in MST.

Parameter Measured	Morning												Afternoon										Parameter Measured	POC
Parameter Measured	Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	Parameter Measured	POC
Nitric Oxide	0.2	0.2	0.1	7.2	7.1	8.0	83.8	114.4	62.8	42.2	2.5	1.2	0.3	0.2	0.3	0.1	0.2	0.2	0.2	1.6	0.5	NA	Nitric Oxide	1 ^MDL
Nitrogen Dioxide	6.2	4.3	7.9	27.3	27.0	26.1	35.0	37.9	33.7	27.9	5.6	3.2	1.0	1.0	1.5	1.5	3.5	15.2	22.3	26.6	25.4	NA	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	6.3	4.4	7.7	33.6	33.1	33.3	115.9	148.5	94.3	68.4	8.1	4.4	1.3	1.3	1.8	1.7	3.7	15.0	21.9	27.4	25.2	NA	Oxides of Nitrogen	1 ^MDL
Ozone	32	32	24	1	4	2	0	1	3	11	27	32	36	37	38	39	37	24	17	9	12	NA	Ozone	1 ^R ^MDL
Wind Speed	12.8	13.3	9.1	4.0	4.2	3.0	2.5	1.9	3.0	4.2	7.5	10.7	12.9	12.4	10.5	8.9	6.5	4.2	2.5	1.4	1.8	NA	Wind Speed	1
Resultant Wind Speed	12.5	13.2	8.8	3.7	4.1	0.6	1.0	1.4	2.5	3.6	7.2	9.9	12.5	12.0	10.0	8.6	6.3	4.2	2.4	1.3	1.6	NA	Resultant Wind Speed	1
Resultant Wind Direction	289	286	299	302	280	138	237	253	309	51	72	97	115	113	112	110	105	98	109	46	83	NA	Resultant Wind Direction	1
Maximum Wind Gust	23.2	21.9	17.0	8.2	8.0	7.3	5.5	4.7	5.6	11.7	13.5	22.5	24.6	25.4	20.8	16.7	13.1	9.5	5.3	4.2	4.6	NA	Maximum Wind Gust	1
Std. Dev. Wind Direction	13	8	15	21	14	72	62	39	33	31	17	22	15	14	18	15	14	9	13	26	28	NA	Std. Dev. Wind Direction	1
Outdoor Temperature	57.1	54.5	50.2	45.0	45.9	44.0	43.3	45.4	49.1	55.7	60.6	63.9	64.7	64.3	65.2	65.3	64.3	61.6	59.0	56.4	55.0	NA	Outdoor Temperature	1
Dew Point Temperature	23.1	22.5	22.1	21.3	21.2	20.6	21.3	21.9	23.6	25.2	27.3	30.0	33.0	33.8	34.0	34.1	34.2	33.8	33.3	33.0	32.6	NA	Dew Point Temperature	1
Relative Humidity	26.7	28.6	32.9	38.7	37.2	39.0	41.3	39.2	36.5	30.7	28.0	28.0	30.5	32.1	31.3	31.3	32.6	35.3	37.8	41.1	42.5	NA	Relative Humidity	1
Visibility	28.49	37.01	45.12	29.36	37.44	46.39	18.43	11.94	16.37	29.94	47.91	34.73	19.17	27.43	38.13	42.38	39.22	30.72	26.62	21.98	26.04	NA	Visibility	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.117	0.401	0.640	0.843	0.938	0.919	0.824	0.633	0.379	0.108	0.000	0.000	0.000	0.000	NA	Solar Radiation	1
Barometric Pressure	901.4	901.2	901.6	902.4	902.7	903.6	904.6	905.6	906.5	907.2	907.2	906.7	906.2	905.7	905.3	905.1	905.0	905.2	905.6	906.0	906.2	NA	Barometric Pressure	1
PM-2.5 (Local Conditions)	4.0	3.0	1.0	4.0	6.0	1.0	18.0	18.0	11.0	10.0	9.0	5.0	6.0	4.0	2.0	2.0	2.0	8.0	5.0	32.0	NA	NA	PM-2.5 (Local Conditions)	4 ^N ^MDL
Parameter Measured	Mid	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	10:00	11:00	Noon	1:00	2:00	3:00	4:00	5:00	6:00	7:00	8:00	9:00	Parameter Measured	POC
Parameter Measured	Morning												Afternoon										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.
	^N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used 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

Ascarate Park SE C37/A332/A172/X159 Data by Site by Date (all parameters)