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Airborne Particulates

Particle pollution (also called particulate matter or PM) is the term for a mixture of solid particles and liquid droplets found in the air. Some particles, such as dust, dirt, soot, or smoke, are large or dark enough to be seen with the naked eye. Others are so small, they can only be detected using an electron microscope. Particle pollution includes inhalable coarse particles, with diameters larger than 2.5 micrometers and smaller than 10 micrometers and fine particles, with diameters that are 2.5 micrometers and smaller. How small is 2.5 micrometers? Think about a single hair from your head. The average human hair is about 70 micrometers in diameter -- making it 30 times larger than the largest fine particle. These particles come in many sizes and shapes and can be made up of hundreds of different chemicals. Some particles, known as primary particles, are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks or fires. Others form in complicated reactions in the atmosphere of chemicals such as sulfur dioxides and nitrogen oxides that are emitted from power plants, industries and automobiles. These particles, known as secondary particles, make up most of the fine particle pollution in the country.

This information is updated hourly. All times shown are Local Standard Time.

Click here for a map showing the current PM-2.5 (Local Conditions) levels.

Click here for a map showing the current PM-2.5 (Local Conditions) Acceptable levels.

Click here for a map showing the current PM-10 (Standard Conditions) levels.

Click here for the current Air Quality Index.

PM-2.5 (Local Conditions)

Fine particulates (PM-2.5) are generally emitted from activities such as industrial and residential combustion and from vehicle exhaust. Fine particles are also formed in the atmosphere when gases such as sulfur dioxide, nitrogen oxides, and volatile organic compounds, emitted by combustion activities, are transformed by chemical reactions in the air. Large-scale agricultural burning or sand storms can produce huge volumes of fine particulates. PM-2.5 data is the near real-time measurement of particulate matter 2.5 microns or less in size from the surrounding air. This measurement is made at local conditions, and is not corrected for temperature or pressure.

The table below contains hourly averages for PM-2.5 (Local Conditions) on Wednesday, July 26, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Dallas-Fort Worth - all times are in Central Standard Time
401 26.023.029.0 FEW NA4 N 401
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
El Paso-Juarez - refer to the first data column for each site's specific time zone
MST41 0.00.0 FEW NA NA6 N 41
CST316 2.07.06.0 FEW NA1 N 316
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Beaumont-Port Arthur - all times are in Central Standard Time
64 15.013.012.0 FEW NA2 N 64
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Austin - all times are in Central Standard Time
171 18.018.022.0 FEW NA3 N 171
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
35 PMA PMA PMA PMA NA4 N 35
148 15.011.011.0 FEW NA2 N 148
1607 1.0-1.0 FEW NA NA1 N 1607
Maximum values for PM-2.5 (Local Conditions) for the day are bold within the table.
PM-2.5 (Local Conditions) is measured in micrograms per cubic meter (local conditions)
 N - Data from this instrument does not meet EPA quality assurance criteria and cannot be used for regulatory purposes.


PM-2.5 (Local Conditions) Acceptable

Fine particulates (PM-2.5) are generally emitted from activities such as industrial and residential combustion and from vehicle exhaust. Fine particles are also formed in the atmosphere when gases such as sulfur dioxide, nitrogen oxides, and volatile organic compounds, emitted by combustion activities, are transformed by chemical reactions in the air. Large-scale agricultural burning or sand storms can produce huge volumes of fine particulates. PM-2.5 data is the near real-time measurement of particulate matter 2.5 microns or less in size from the surrounding air. This measurement is made at local conditions, and is not corrected for temperature or pressure.

The table below contains hourly averages for PM-2.5 (Local Conditions) Acceptable on Wednesday, July 26, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Amarillo - all times are in Central Standard Time
320 14.413.513.312.3 NA3 320
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Lubbock - all times are in Central Standard Time
1028 12.313.013.312.7 FEW3 1028
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Dallas-Fort Worth - all times are in Central Standard Time
52 21.321.221.220.5 FEW3 52
56 18.818.517.117.0 FEW3 56
61 20.120.220.318.9 FEW3 61
71 20.218.819.218.3 FEW3 71
310 19.319.619.519.1 FEW3 310
1051 19.417.016.416.0 FEW3 1051
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Tyler-Longview-Marshall - all times are in Central Standard Time
85 20.319.718.417.3 FEW3 85
1031 23.321.220.921.3 FEW3 1031
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
El Paso-Juarez - all times are in Mountain Standard Time
12 1.91.91.9 FEW NA3 12
37 4.14.66.0 FEW NA3 37
49 LIM LIM LIM LIM NA3 49
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Odessa-Midland - all times are in Central Standard Time
1014 13.713.511.79.7 FEW3 1014
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Waco - all times are in Central Standard Time
1037 14.113.012.912.5 FEW3 1037
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Beaumont-Port Arthur - all times are in Central Standard Time
642 9.810.410.211.0 FEW3 642
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Austin - all times are in Central Standard Time
3 22.919.016.715.5 FEW3 3
38 17.716.716.213.5 FEW3 38
326 18.318.118.318.9 FEW3 326
601 15.114.211.515.1 FEW3 601
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
8 8.410.016.213.6 FEW3 8
35 12.312.112.911.6 FEW3 35
45 12.410.39.910.0 FEW3 45
78 16.815.213.714.6 FEW3 78
403 12.26.99.410.1 FEW3 403
416 11.99.89.610.6 FEW3 416
697 8.8 FEW FEW FEW NA3 697
699 FEW FEW FEW FEW FEW3 699
1034 LIM LIM LIM LIM LIM3 1034
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
San Antonio - all times are in Central Standard Time
23 16.414.113.112.8 FEW3 23
59 16.815.315.314.9 FEW3 59
301 19.417.617.116.8 FEW3 301
622 20.718.517.617.5 FEW3 622
676 18.816.315.814.0 FEW3 676
677 18.316.016.015.1 NA3 677
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Corpus Christi-Victoria - all times are in Central Standard Time
314 5.73.45.29.6 FEW3 314
635 2.54.35.24.7 NA3 635
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Lower Rio Grande Valley - all times are in Central Standard Time
43 5.94.42.32.9 FEW3 43
80 PMA PMA PMA PMA PMA3 80
323 3.44.96.05.9 FEW3 323
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Laredo - all times are in Central Standard Time
313 7.94.32.14.3 FEW3 313
319 8.66.68.28.6 FEW3 319
Maximum values for PM-2.5 (Local Conditions) Acceptable for the day are bold within the table.
PM-2.5 (Local Conditions) Acceptable is measured in micrograms per cubic meter (local conditions)


PM-10 (Standard Conditions)

Coarse particulates (PM-10) come from sources such as windblown dust from the desert or agricultural fields (sand storms) and dust kicked up on unpaved roads by vehicle traffic. PM-10 data is the near real-time measurement of particulate matter 10 microns or less in size from the surrounding air. This measurement is made at standard conditions, meaning it is corrected for local temperature and pressure.

The table below contains hourly averages for PM-10 (Standard Conditions) on Wednesday, July 26, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
El Paso-Juarez - all times are in Mountain Standard Time
12 14.517.622.5 FEW NA4 N 12
49 LIM LIM LIM LIM NA4 N 49
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
1607 26.019.0 FEW NA NA1 N 1607
Maximum values for PM-10 (Standard Conditions) for the day are bold within the table.
PM-10 (Standard Conditions) is measured in ug/cu meter (25 c)
 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.