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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 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 Monday, September 22, 2014.

         
Select a Region:
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Dallas-Fort Worth - all times are in Central Standard Time
401 13.011.08.01.0-1.030.0 NEG0.08.010.010.09.0 FEW NA NA4 401
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
El Paso-Juarez - all times are in Mountain Standard Time
41 -1.02.04.02.02.0 NEG-2.08.010.08.06.0 FEW LST NA NA6 41
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
35 17.012.015.016.015.027.025.028.020.013.016.018.0 FEW NA NA4 35
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)


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 Monday, September 22, 2014.

         
Select a Region:
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Amarillo - all times are in Central Standard Time
320 1.63.11.73.13.43.85.25.54.62.24.04.05.65.2 NA3 320
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Dallas-Fort Worth - all times are in Central Standard Time
52 19.811.010.39.36.77.26.16.06.56.46.75.86.5 FEW NA3 52
56 0.92.62.14.83.23.34.94.85.43.93.22.62.62.4 NA3 56
61 13.58.78.13.32.84.15.25.35.64.34.55.55.0 FEW NA3 61
71 16.113.314.511.14.47.46.94.31.81.73.33.02.64.3 NA3 71
310 5.25.24.70.51.82.14.54.57.48.14.25.15.63.1 NA3 310
401 11.68.33.42.52.78.34.83.44.34.24.14.74.03.8 NA3 401
1044 14.017.816.815.413.111.18.86.17.93.22.62.85.45.9 NA3 1044
1051 13.716.117.015.813.613.915.514.74.72.81.72.94.74.4 NA3 1051
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Tyler-Longview-Marshall - all times are in Central Standard Time
85 LIM LIM LIM LIM LIM LIM LIM LIM LIM LIM PMA7.91.81.1 NA3 85
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
El Paso-Juarez - refer to the first data column for each site's specific time zone
MST12 2.42.62.75.45.02.63.13.84.64.25.33.72.8 NA NA3 12
MST37 4.45.35.16.07.53.47.59.48.29.09.18.38.6 NA NA3 37
MST49 3.23.73.74.14.64.55.14.84.33.84.43.54.9 NA NA3 49
CST316 4.75.01.52.76.55.05.15.310.010.92.77.02.01.0 NA3 316
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Odessa-Midland - all times are in Central Standard Time
47 4.65.35.66.25.66.58.610.28.99.18.55.24.67.3 NA3 47
1014 4.75.06.17.06.36.98.19.410.48.28.16.34.87.9 NA3 1014
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Waco - all times are in Central Standard Time
1037 10.58.49.810.113.311.911.813.712.513.012.811.09.05.8 NA3 1037
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Beaumont-Port Arthur - all times are in Central Standard Time
64 11.010.210.411.913.314.119.920.014.713.515.314.815.818.4 NA3 64
642 8.68.98.48.79.29.916.920.914.518.118.118.715.912.7 NA3 642
689 15.913.713.113.915.614.715.722.811.617.019.120.916.6 FEW NA3 689
1050 19.115.814.615.316.018.721.621.718.019.718.315.515.913.8 NA3 1050
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Austin - all times are in Central Standard Time
3 6.35.75.86.06.36.57.47.67.88.28.08.710.611.2 NA3 3
38 8.110.69.010.210.311.016.414.514.014.213.513.416.5 FEW NA3 38
171 12.811.18.67.68.310.215.18.310.512.412.712.217.918.2 NA3 171
326 11.810.49.910.211.712.312.914.214.513.716.215.316.319.7 NA3 326
601 12.111.011.711.412.312.515.514.814.211.713.517.720.318.7 NA3 601
1026 11.210.810.310.811.612.013.311.911.612.912.912.816.517.4 NA3 1026
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
1 18.218.116.716.518.320.623.821.220.017.216.614.313.714.8 NA3 1
8 17.415.515.316.817.418.220.118.916.215.014.613.914.9 FEW NA3 8
35 11.412.114.111.513.017.925.443.57.616.8 LST LST LST NA NA3 35
45 15.014.611.913.413.917.220.936.211.816.918.823.617.113.5 NA3 45
78 18.519.017.917.316.818.615.818.420.720.619.316.914.8 FEW NA3 78
148 15.614.915.515.014.915.117.417.511.813.810.311.510.5 FEW NA3 148
309 22.821.520.016.816.917.718.615.618.518.314.314.813.314.7 NA3 309
403 18.317.817.617.817.422.727.025.820.814.815.614.514.013.4 NA3 403
416 21.616.818.118.520.724.727.826.824.320.418.518.416.914.3 NA3 416
1034 12.713.311.511.910.915.016.314.613.910.516.78.811.615.1 NA3 1034
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
San Antonio - all times are in Central Standard Time
23 12.011.011.912.711.612.212.414.513.614.112.615.214.9 FEW NA3 23
59 14.113.113.613.713.916.018.023.217.314.114.815.615.0 FEW NA3 59
301 10.810.710.210.210.511.012.211.412.916.813.613.414.416.4 NA3 301
622 10.510.711.614.215.024.525.118.718.413.012.814.012.813.1 NA3 622
676 11.612.413.514.314.614.815.817.117.315.515.116.516.015.3 NA3 676
677 12.812.212.412.313.012.512.714.613.813.813.815.814.913.7 NA3 677
678 13.313.916.916.215.715.416.216.813.213.014.016.014.6 FEW NA3 678
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Corpus Christi-Victoria - all times are in Central Standard Time
314 7.58.710.59.89.19.59.818.67.48.89.115.514.3 FEW NA3 314
635 13.115.212.612.69.68.913.014.4 FEW LST LST LST LST NA NA3 635
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Lower Rio Grande Valley - all times are in Central Standard Time
43 2.63.71.83.64.84.76.38.07.66.96.56.76.03.0 NA3 43
80 2.92.82.42.11.62.33.45.16.27.43.95.02.84.3 NA3 80
323 4.85.03.42.62.14.05.65.37.46.17.48.45.45.1 NA3 323
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Laredo - all times are in Central Standard Time
313 13.510.39.37.710.78.811.311.49.711.612.710.49.36.5 NA3 313
319 8.38.36.57.89.09.910.511.510.411.313.812.111.28.8 NA3 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 Monday, September 22, 2014.

         
Select a Region:
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
El Paso-Juarez - all times are in Mountain Standard Time
12 7.47.27.611.19.15.47.48.811.212.712.08.27.5 NA NA4 N 12
49 8.89.89.710.210.510.813.614.714.613.114.412.123.3 NA NA4 N 49
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.


PM-10 (Local 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 local conditions, meaning it is not corrected for temperature or pressure.

The table below contains hourly averages for PM-10 (Local Conditions) on Monday, September 22, 2014.

         
Select a Region:
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Dallas-Fort Worth - all times are in Central Standard Time
401 17.0016.0017.0015.0019.0035.0021.0024.0039.0031.0029.0022.00 FEW NA NA4 N 401
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
El Paso-Juarez - all times are in Mountain Standard Time
41 -1.00-1.003.0020.001.00 NEG2.002.0017.004.0030.00 FEW LST NA NA6 N 41
AreaCAMSMorningAfternoonPOCCAMS
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00
Houston-Galveston-Brazoria - all times are in Central Standard Time
35 23.0027.0030.0023.0030.0039.0057.0059.0027.0028.0026.0030.00 FEW NA NA4 N 35
Maximum values for PM-10 (Local Conditions) for the day are bold within the table.
PM-10 (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.


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 beginning 1/1/2013, 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.