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2011 | Williamson, Texas | Air pollution-particulate matter days

Summary Information

Range in Texas
(Min-Max):		 0-6
Overall in Texas: 1
National Benchmark: 0 (90th percentile)

Ranking Methodology

Summary Measure: Health Factors - Physical Environment (Air Quality)
Weight in Health Factors: 2.5%
Years of Data Used: 2006
Map ↓
The counties are shaded with lighter counties having a better rank. Gray counties are not reported (NR).
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The air pollution—particulate matter measure represents the annual number of days that air quality was unhealthy for sensitive populations due to fine particulate matter (FPM, < 2.5 µm in diameter).

The Public Health Air Surveillance Evaluation (PHASE) project, a collaborative effort between the Centers for Disease Control and Prevention (CDC) and the EPA, used Community Multi-Scale Air Quality Model (CMAQ) output and air quality monitor data to create a spatial-temporal model that estimated fine particulate matter concentrations throughout the year. The PHASE estimates were used to calculate the number of days per year that air quality in a county was unhealthy for sensitive population due to FPM.  The state and national values are an average of county values weighted by population size.


The relationship between elevated air pollution—particularly fine particulate matter and ozone—and compromised health has been well documented. The negative consequences of ambient air pollution include decreased lung function, chronic bronchitis, asthma, and other adverse pulmonary effects.

More Information

Scroll down for details on this measure for all of the counties in this state.

Table ↓
PM Days Number of days in 2006 that air quality was unhealthy due to fine particulate matter
Z-Score (Measure - Average of TX counties)/(Standard Deviation)
PlacePM DaysZ-Score
Anderson0-0.32
Andrews0-0.32
Angelina0-0.32
Aransas0-0.32
Archer0-0.32
Armstrong0NR
Atascosa11.24
Austin34.38
Bailey0-0.32
Bandera0-0.32
Bastrop0-0.32
Baylor0-0.32
Bee0-0.32
Bell0-0.32
Bexar11.24
Blanco0-0.32
Borden0NR
Bosque0-0.32
Bowie34.38
Brazoria0-0.32
Brazos0-0.32
Brewster0-0.32
Briscoe0NR
Brooks11.24
Brown0-0.32
Burleson0-0.32
Burnet0-0.32
Caldwell0-0.32
Calhoun0-0.32
Callahan0-0.32
Cameron0-0.32
Camp11.24
Carson0-0.32
Cass11.24
Castro0-0.32
Chambers0-0.32
Cherokee0-0.32
Childress0-0.32
Clay0-0.32
Cochran0-0.32
Coke0NR
Coleman0-0.32
Collin0-0.32
Collingsworth0-0.32
Colorado22.81
Comal0-0.32
Comanche0-0.32
Concho0NR
Cooke0-0.32
Coryell0-0.32
Cottle0NR
Crane0-0.32
Crockett0-0.32
Crosby0-0.32
Culberson0-0.32
Dallam0-0.32
Dallas0-0.32
Dawson0-0.32
Deaf Smith0-0.32
Delta0-0.32
Denton0-0.32
DeWitt0-0.32
Dickens0NR
Dimmit0-0.32
Donley0-0.32
Duval0-0.32
Eastland0-0.32
Ector0-0.32
Edwards0NR
El Paso11.24
Ellis0-0.32
Erath0-0.32
Falls0-0.32
Fannin0-0.32
Fayette0-0.32
Fisher0-0.32
Floyd0-0.32
Foard0NR
Fort Bend69.07
Franklin0-0.32
Freestone0-0.32
Frio0-0.32
Gaines0-0.32
Galveston0-0.32
Garza0-0.32
Gillespie0-0.32
Glasscock0NR
Goliad0-0.32
Gonzales0-0.32
Gray0-0.32
Grayson0-0.32
Gregg0-0.32
Grimes0-0.32
Guadalupe11.24
Hale0-0.32
Hall0-0.32
Hamilton0-0.32
Hansford0-0.32
Hardeman0-0.32
Hardin0-0.32
Harris34.38
Harrison0-0.32
Hartley0-0.32
Haskell0-0.32
Hays0-0.32
Hemphill0NR
Henderson0-0.32
Hidalgo0-0.32
Hill0-0.32
Hockley0-0.32
Hood0-0.32
Hopkins0-0.32
Houston0-0.32
Howard0-0.32
Hudspeth0-0.32
Hunt0-0.32
Hutchinson0-0.32
Irion0NR
Jack0-0.32
Jackson11.24
Jasper0-0.32
Jeff Davis0NR
Jefferson11.24
Jim Hogg11.24
Jim Wells0-0.32
Johnson0-0.32
Jones0-0.32
Karnes0-0.32
Kaufman0-0.32
Kendall0-0.32
Kenedy1NR
Kent0NR
Kerr0-0.32
Kimble0-0.32
King0NR
Kinney0NR
Kleberg11.24
Knox0-0.32
La Salle0-0.32
Lamar0-0.32
Lamb0-0.32
Lampasas0-0.32
Lavaca0-0.32
Lee0-0.32
Leon0-0.32
Liberty0-0.32
Limestone0-0.32
Lipscomb0NR
Live Oak0-0.32
Llano0-0.32
Loving0NR
Lubbock0-0.32
Lynn0-0.32
Madison0-0.32
Marion0-0.32
Martin0-0.32
Mason0NR
Matagorda11.24
Maverick0-0.32
McCulloch0-0.32
McLennan0-0.32
McMullen0NR
Medina0-0.32
Menard0NR
Midland0-0.32
Milam11.24
Mills0-0.32
Mitchell0-0.32
Montague0-0.32
Montgomery22.81
Moore0-0.32
Morris11.24
Motley0NR
Nacogdoches0-0.32
Navarro0-0.32
Newton0-0.32
Nolan0-0.32
Nueces0-0.32
Ochiltree0-0.32
Oldham0NR
Orange11.24
Palo Pinto0-0.32
Panola0-0.32
Parker0-0.32
Parmer0-0.32
Pecos0-0.32
Polk11.24
Potter0-0.32
Presidio0-0.32
Rains0-0.32
Randall0-0.32
Reagan0-0.32
Real0-0.32
Red River0-0.32
Reeves0-0.32
Refugio0-0.32
Roberts0NR
Robertson0-0.32
Rockwall0-0.32
Runnels0-0.32
Rusk0-0.32
Sabine11.24
San Augustine0-0.32
San Jacinto11.24
San Patricio0-0.32
San Saba0-0.32
Schleicher0NR
Scurry0-0.32
Shackelford0-0.32
Shelby11.24
Sherman0NR
Smith0-0.32
Somervell0-0.32
Starr0-0.32
Stephens0-0.32
Sterling0NR
Stonewall0NR
Sutton0-0.32
Swisher0-0.32
Tarrant0-0.32
Taylor0-0.32
Terrell0NR
Terry0-0.32
Throckmorton0NR
Titus11.24
Tom Green0-0.32
Travis0-0.32
Trinity0-0.32
Tyler0-0.32
Upshur0-0.32
Upton0-0.32
Uvalde0-0.32
Val Verde0-0.32
Van Zandt0-0.32
Victoria0-0.32
Walker0-0.32
Waller11.24
Ward0-0.32
Washington11.24
Webb0-0.32
Wharton22.81
Wheeler0-0.32
Wichita0-0.32
Wilbarger0-0.32
Willacy11.24
Williamson11.24
Wilson11.24
Winkler0-0.32
Wise0-0.32
Wood0-0.32
Yoakum0-0.32
Young0-0.32
Zapata0-0.32
Zavala0-0.32

NR in Z-Score column indicates county "not ranked"