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 Monday, December 8, 2025. All times shown are in CST.

Parameter Measured	Morning												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	Parameter Measured	POC
NOy	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	LIM	NA	NOy	2 ^MDL
Nitric Oxide	LIM	SPZ	SPZ	LIM	LIM	LIM	PMA	CAL	CAL	CAL	CAL	NA	Nitric Oxide	1 ^MDL
Nitric Oxide	0.2	0.2	0.2	0.2	0.3	0.7	1.1	1.3	2.4	2.3	FEW	NA	Nitric Oxide	2 ^MDL
Nitrogen Dioxide	LIM	SPZ	SPZ	LIM	LIM	LIM	PMA	CAL	CAL	CAL	CAL	NA	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	LIM	SPZ	SPZ	LIM	LIM	LIM	PMA	CAL	CAL	CAL	CAL	NA	Oxides of Nitrogen	1 ^MDL
Ozone	24	24	23	23	22	19	17	16	13	16	FEW	NA	Ozone	2 ^R ^MDL
Wind Speed	11.4	10.7	10.6	10.4	9.3	7.6	8.5	7.2	7.2	7.2	FEW	NA	Wind Speed	1
Wind Direction	349	266	235	355	297	324	267	268	181	129	FEW	NA	Wind Direction	1
Resultant Wind Speed	11.1	10.4	10.4	10.2	9.1	7.4	8.3	7.0	7.0	6.7	FEW	NA	Resultant Wind Speed	1
Resultant Wind Direction	349	356	355	356	357	354	357	358	1	8	FEW	NA	Resultant Wind Direction	1
Maximum Wind Gust	26.2	21.1	21.0	19.6	17.1	16.6	16.3	14.7	12.1	13.4	FEW	NA	Maximum Wind Gust	1
Std. Dev. Wind Direction	12	13	12	11	12	13	12	14	13	21	FEW	NA	Std. Dev. Wind Direction	1
Outdoor Temperature	52.8	52.4	51.7	50.9	50.4	49.7	49.4	49.0	48.7	49.2	FEW	NA	Outdoor Temperature	1
Dew Point Temperature	46.4	45.6	44.4	43.6	43.4	42.9	42.5	42.1	42.0	41.9	FEW	NA	Dew Point Temperature	1
Relative Humidity	78.8	77.5	76.0	76.0	76.6	77.3	77.2	77.0	77.5	75.8	FEW	NA	Relative Humidity	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.024	0.081	0.361	FEW	NA	Solar Radiation	1
Barometric Pressure	1018.1	1018.3	1018.8	1019.2	1019.5	1020.0	1020.6	1021.2	1022.0	1022.7	FEW	NA	Barometric Pressure	1
PM-2.5 (Local Conditions)	6.9	10.0	11.3	7.3	10.4	9.0	8.2	6.7	9.5	FEW	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	Parameter Measured	POC
Parameter Measured	Morning												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)