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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 Tuesday, March 28, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Dallas-Fort Worth - all times are in Central Standard Time
401 15.010.09.09.0 FEW NA4 N 401
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
El Paso-Juarez - all times are in Mountain Standard Time
41 PMA PMA PMA PMA NA NA6 N 41
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
35 NEG-10.0 NEG NEG FEW NA4 N 35
1054 PMA PMA PMA PMA PMA NA1 N 1054
1607 17.019.015.0 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 Tuesday, March 28, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Amarillo - all times are in Central Standard Time
320 5.56.36.95.54.34.73 320
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Lubbock - all times are in Central Standard Time
1028 5.35.14.65.67.911.63 1028
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Dallas-Fort Worth - all times are in Central Standard Time
52 LIM LIM LIM LIM LIM LIM3 52
56 8.28.78.17.76.95.03 56
61 10.39.58.08.310.812.43 61
71 9.010.09.79.811.912.33 71
310 12.211.59.28.010.911.93 310
1051 12.411.610.011.014.7 FEW3 1051
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Tyler-Longview-Marshall - all times are in Central Standard Time
85 13.614.413.014.312.5 FEW3 85
1031 7.57.87.86.37.8 FEW3 1031
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
El Paso-Juarez - all times are in Mountain Standard Time
12 LIM LIM LIM LIM LIM NA3 12
37 LIM LIM LIM LIM LIM NA3 37
49 10.211.011.312.211.4 NA3 49
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Odessa-Midland - all times are in Central Standard Time
1014 7.27.59.321.834.233.93 1014
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Waco - all times are in Central Standard Time
1037 7.37.57.410.09.4 FEW3 1037
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Beaumont-Port Arthur - all times are in Central Standard Time
64 PMA PMA PMA PMA PMA PMA3 64
303 9.17.96.76.56.25.83 303
642 7.74.26.54.84.03.13 642
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Austin - all times are in Central Standard Time
3 8.88.910.910.79.610.33 3
38 13.313.812.514.314.013.83 38
171 QAS QAS QAS QAS QAS QAS3 171
326 11.011.412.012.011.814.03 326
601 9.310.911.313.713.915.73 601
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
1 PMA PMA PMA PMA PMA PMA3 1
8 10.311.09.87.410.59.93 8
35 11.89.68.88.87.78.73 35
45 9.98.48.08.27.6 FEW3 45
78 11.49.99.610.711.311.43 78
403 12.411.89.19.910.714.73 403
416 11.611.59.29.09.611.03 416
1034 9.68.89.09.58.88.73 1034
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
San Antonio - all times are in Central Standard Time
23 12.812.913.714.113.8 FEW3 23
59 9.69.310.411.913.014.83 59
301 12.111.411.411.711.914.23 301
622 10.710.611.913.013.414.63 622
676 PMA PMA PMA PMA PMA PMA3 676
677 13.112.013.313.612.9 FEW3 677
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Corpus Christi-Victoria - all times are in Central Standard Time
314 14.417.415.714.110.59.83 314
635 18.323.121.518.216.4 FEW3 635
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Lower Rio Grande Valley - all times are in Central Standard Time
43 17.016.115.514.117.823.23 43
80 PMA PMA PMA PMA NA NA3 80
323 LIM LIM LIM LIM LIM LIM3 323
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Laredo - all times are in Central Standard Time
313 11.813.214.017.919.420.43 313
319 2.12.02.11.92.12.13 319
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 Tuesday, March 28, 2017.

         
Select a Region:
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
El Paso-Juarez - all times are in Mountain Standard Time
12 LIM LIM LIM LIM LIM NA4 N 12
49 20.522.123.024.727.6 NA4 N 49
AreaCAMSMorningPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
1607 31.041.033.0 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.