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 Thursday, March 5, 2026. 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	5:00	6:00	7:00	Parameter Measured	POC
NOy	8.6	7.3	6.0	6.1	7.2	8.5	13.0	11.7	SPN	SPN	SPN	5.8	6.1	6.6	7.2	5.5	5.5	8.2	13.6	NA	NOy	2 ^MDL
Nitric Oxide	0.1	0.1	0.1	0.2	0.2	0.2	0.3	0.7	1.0	1.2	1.2	1.2	PMA	1.2	1.4	1.1	1.0	0.9	0.5	NA	Nitric Oxide	1 ^MDL
Nitric Oxide	0.0	0.0	0.0	-0.0	-0.0	0.1	0.3	0.6	SPN	SPN	SPN	1.3	1.2	1.2	1.6	1.1	0.9	0.8	0.3	NA	Nitric Oxide	2 ^MDL
Nitrogen Dioxide	1.9	1.0	0.1	0.3	1.2	2.1	5.8	4.5	2.2	0.4	-1.3	-1.2	PMA	-0.8	-0.4	-1.5	-1.3	1.0	5.6	NA	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	1.8	0.9	-0.0	0.2	1.0	2.0	5.7	4.8	2.8	1.3	-0.4	-0.3	PMA	0.1	0.7	-0.6	-0.6	1.5	5.5	NA	Oxides of Nitrogen	1 ^MDL
Ozone	17	18	19	19	20	19	16	18	22	26	30	33	PMA	32	30	30	27	24	20	NA	Ozone	2 ^R ^MDL
Wind Speed	5.7	5.0	6.2	6.0	7.4	7.2	8.1	8.4	9.1	8.5	9.6	11.6	11.1	11.3	12.0	12.4	12.5	10.4	9.3	NA	Wind Speed	1
Wind Direction	144	132	150	168	163	158	155	166	167	176	172	158	158	155	150	146	147	138	127	NA	Wind Direction	1
Resultant Wind Speed	5.5	4.8	6.0	5.8	7.3	7.0	7.9	8.2	8.8	8.2	9.1	11.2	10.5	10.7	11.4	11.9	12.0	9.8	9.1	NA	Resultant Wind Speed	1
Resultant Wind Direction	143	133	150	168	162	158	155	166	166	177	171	158	157	154	149	145	146	139	127	NA	Resultant Wind Direction	1
Maximum Wind Gust	10.2	10.6	12.6	12.8	20.9	21.0	16.3	17.0	20.6	18.5	19.0	23.7	23.3	21.6	23.9	22.4	22.4	20.0	18.6	NA	Maximum Wind Gust	1
Std. Dev. Wind Direction	13	17	15	13	13	15	15	14	14	17	18	15	19	17	17	16	16	19	14	NA	Std. Dev. Wind Direction	1
Outdoor Temperature	71.2	71.2	70.9	70.7	70.7	71.1	70.7	71.1	72.2	73.8	76.4	79.1	80.3	80.2	79.9	80.2	78.8	76.9	73.6	NA	Outdoor Temperature	1
Dew Point Temperature	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	67.6	67.0	66.7	66.3	66.2	66.1	66.0	66.8	67.8	NA	Dew Point Temperature	1
Relative Humidity	88.0	88.1	88.7	89.0	88.5	87.7	88.0	86.9	84.0	80.0	74.2	66.5	63.2	62.6	62.9	62.2	64.9	71.4	82.3	NA	Relative Humidity	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.000	0.001	0.051	0.142	0.307	0.682	PMA	0.887	0.611	0.591	0.648	0.332	0.114	0.008	NA	Solar Radiation	1
Barometric Pressure	1013.7	1013.4	1012.9	1012.3	1011.9	1011.9	1012.0	1012.3	1012.9	1013.3	1013.3	1013.0	1012.3	1011.8	1011.4	1010.9	1010.6	1010.5	1010.6	NA	Barometric Pressure	1
PM-2.5 (Local Conditions)	10.2	9.0	5.6	3.8	6.0	6.6	4.6	9.5	7.3	8.5	QAS	NEG	13.4	10.9	7.1	8.1	7.5	10.8	NA	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	5:00	6:00	7:00	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)