X150 Data by Site by Date (all parameters)

Use this form to retrieve hourly data collected at Houston Aldine C8/AF108/X150 . 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 Houston Aldine C8/AF108/X150 for Tuesday, December 23, 2025. All times shown are in CST.

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	Parameter Measured	POC
NOy	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	PMA	LIM	SPN	SPN	SPN	NOy	2 ^MDL
Nitric Oxide	-0.2	-0.4	-0.2	-0.2	-0.3	-0.2	-0.2	1.8	6.5	5.1	3.1	2.9	2.0	0.8	0.4	0.8	FEW	Nitric Oxide	1 ^MDL
Nitric Oxide	0.1	0.1	0.1	0.1	0.2	0.2	0.2	2.9	8.1	6.5	4.3	4.1	3.0	1.5	SPN	SPN	SPN	Nitric Oxide	2 ^MDL
Nitrogen Dioxide	0.9	1.6	1.7	-0.3	4.1	6.5	8.0	15.9	15.7	13.5	11.3	12.8	9.5	5.0	4.5	8.4	FEW	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	0.7	1.2	1.4	-0.5	3.8	6.2	7.7	17.6	22.0	18.5	14.3	15.6	11.4	5.8	4.8	9.1	FEW	Oxides of Nitrogen	1 ^MDL
Ozone	27	26	27	29	21	20	20	9	8	14	25	32	34	41	45	43	FEW	Ozone	2 ^R ^MDL
Wind Speed	6.8	5.4	5.2	5.4	2.9	4.2	3.4	2.0	3.5	5.1	6.6	6.5	5.4	6.0	6.9	7.8	FEW	Wind Speed	1
Wind Direction	162	165	174	170	154	155	160	118	105	121	133	146	133	126	124	115	FEW	Wind Direction	1
Resultant Wind Speed	6.6	5.2	5.0	5.2	2.8	4.0	3.2	1.9	3.4	4.8	6.1	6.0	4.6	5.6	6.4	7.3	FEW	Resultant Wind Speed	1
Resultant Wind Direction	161	165	174	172	154	157	160	116	107	123	133	145	133	125	123	116	FEW	Resultant Wind Direction	1
Maximum Wind Gust	13.8	12.7	15.0	12.8	9.1	9.5	8.4	4.3	7.4	10.6	13.5	12.5	10.9	13.8	13.6	15.1	FEW	Maximum Wind Gust	1
Std. Dev. Wind Direction	12	14	14	15	16	18	15	20	17	21	23	23	30	22	21	20	FEW	Std. Dev. Wind Direction	1
Outdoor Temperature	72.0	71.9	71.8	71.0	70.2	70.5	70.3	70.0	70.8	72.1	73.7	74.4	76.0	78.4	78.5	77.3	FEW	Outdoor Temperature	1
Dew Point Temperature	68.7	68.5	68.3	67.7	67.3	67.4	67.3	67.3	67.7	68.2	68.5	68.2	68.1	67.2	66.3	68.4	FEW	Dew Point Temperature	1
Relative Humidity	89.3	89.0	88.9	89.1	90.5	90.0	90.3	91.0	90.1	87.4	83.8	81.2	76.7	68.5	66.3	74.1	FEW	Relative Humidity	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.036	0.180	0.233	0.451	0.553	0.582	0.581	0.331	0.318	FEW	Solar Radiation	1
Barometric Pressure	1018.8	1018.7	1018.7	1018.7	1018.8	1019.3	1020.0	1020.7	1021.5	1021.9	1021.8	1021.4	1020.4	1019.6	1019.4	1019.3	FEW	Barometric Pressure	1
PM-2.5 (Local Conditions)	6.7	7.4	8.5	8.6	7.5	7.5	5.0	8.1	18.3	12.2	12.5	18.6	11.9	7.0	9.7	FEW	NA	PM-2.5 (Local Conditions)	4 ^R ^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	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.

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

Houston Aldine C8/AF108/X150 Data by Site by Date (all parameters)