X154 Data by Site by Date (all parameters)

Use this form to retrieve hourly data collected at Northwest Harris Co. C26/A110/X154. 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 Northwest Harris Co. C26/A110/X154 for Thursday, May 16, 2024. 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	8:00	9:00	10:00	11:00	Parameter Measured	POC
Nitric Oxide	3.5	5.2	1.4	1.0	1.7	0.9	1.2	6.3	2.3	-1.3	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	NA	Nitric Oxide	1 ^MDL
Nitrogen Dioxide	NEG	NEG	NEG	NEG	-2.3	0.8	4.0	3.7	2.8	NEG	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	NA	Nitrogen Dioxide	1 ^R ^MDL
Oxides of Nitrogen	-1.2	0.9	-2.4	-2.1	-0.6	1.7	5.1	10.0	5.1	NEG	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	NA	Oxides of Nitrogen	1 ^MDL
Ozone	42	34	22	17	22	22	24	34	41	49	47	42	35	31	25	24	23	PMA	45	43	41	39	NA	NA	Ozone	2 ^R ^MDL
Wind Speed	2.6	1.6	0.9	1.2	2.3	2.6	4.8	8.2	9.4	9.8	11.7	9.4	7.0	6.9	8.9	8.4	5.5	PMA	6.2	4.1	3.5	3.2	NA	NA	Wind Speed	1
Wind Direction	276	211	172	188	83	122	131	141	143	145	146	143	151	139	148	164	166	PMA	45	27	48	36	NA	NA	Wind Direction	1
Resultant Wind Speed	1.3	0.4	0.2	0.5	2.0	2.5	4.6	8.0	9.1	9.4	11.4	9.1	6.9	6.7	8.7	8.1	1.1	PMA	4.5	2.9	2.2	2.1	NA	NA	Resultant Wind Speed	1
Resultant Wind Direction	279	331	95	51	97	123	131	141	143	146	146	142	151	139	148	164	170	PMA	46	26	45	36	NA	NA	Resultant Wind Direction	1
Maximum Wind Gust	8.4	4.5	3.4	3.6	6.2	5.6	12.4	15.2	18.7	19.2	22.5	18.0	14.3	14.9	20.4	16.0	22.3	PMA	25.3	14.0	14.9	14.5	NA	NA	Maximum Wind Gust	1
Std. Dev. Wind Direction	57	69	70	64	31	15	15	13	15	16	14	14	12	13	14	15	72	PMA	43	44	50	48	NA	NA	Std. Dev. Wind Direction	1
Outdoor Temperature	75.1	73.6	71.4	70.6	71.1	71.4	73.4	76.7	79.7	81.7	82.6	82.5	81.3	79.1	77.4	77.5	77.7	PMA	66.7	68.2	69.2	68.6	NA	NA	Outdoor Temperature	1
Dew Point Temperature	69.6	69.3	69.0	68.7	68.8	68.9	70.4	71.2	71.4	72.5	72.8	73.5	74.8	75.7	76.5	76.9	76.6	PMA	66.7	67.0	66.5	66.1	NA	NA	Dew Point Temperature	1
Relative Humidity	83.1	86.5	92.1	93.6	92.6	92.0	90.6	83.1	75.8	73.7	72.4	74.2	80.6	89.5	97.3	97.8	96.4	PMA	LIM	95.2	91.1	91.5	NA	NA	Relative Humidity	1
Solar Radiation	0.000	0.000	0.000	0.000	0.000	0.008	0.089	0.371	0.728	0.848	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	PMA	NA	NA	Solar Radiation	1
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	10:00	11:00	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

Northwest Harris Co. C26/A110/X154 Data by Site by Date (all parameters)