Cass County, Texas Air Quality

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

• Air Quality Alert Air Quality Alert issued September 23 at 2:52PM CDT by NWS Houston/Galveston TXInland Harris; Inland Brazoria; Inland Galveston; Coastal Harris; Coastal Brazoria; Coastal Galveston; Brazoria Islands; Galveston Island; Bolivar Peninsula
  Full text

  AQAHGX The Texas Commission on Environmental Quality (TCEQ) has issued an Ozone Action Day for the Houston, Galveston, and Brazoria area for Thursday, September 24, 2026. Atmospheric conditions are expected to be favorable for producing high levels of ozone pollution in the Houston, Galveston, and surrounding areas on Thursday . You can help prevent ozone pollution by sharing a ride, walking, riding a bicycle, taking your lunch to work, avoiding drive through lanes, conserving energy and keeping your vehicle properly tuned. For more information on ozone: Ozone: The Facts www.tceq.texas.gov/airquality/monops/ozonefacts.html EPA AirNow: www.airnow.gov/?city=Houston&state=TX&country=USA Take Care of Texas: www.takecareoftexas.org/conservation-tips/keep-our-air-clean

All Texas warnings

Good

Nearest monitor

Texarkana New Boston, 29 miles away (site 480371031)

Index measured

42 · Good

Measured at

Wed, 10:00 PM CDT

Reporting area

Shreveport, LA, 51 miles away

Reported by

Louisiana Department of Environmental Quality

Area index

52 · Moderate

Measured, not modeled. AirNow observations are preliminary until the operating agency certifies them, which happens months later.

Louisiana Department of Environmental Quality's own forecast for Shreveport, written by a forecaster rather than read off a model.

Written by Louisiana Department of Environmental Quality for Shreveport and filed with AirNow.

NOAA’s National Air Quality Forecast Capability, bias-corrected against monitors, for this town’s own coordinate. The worst hour ahead is an index of 63, Moderate, around Thu, 11:00 AM CDT, from the run issued Wed, 10:00 PM CDT. This is a model, not a measurement.

Fine particles in micrograms per cubic meter, ozone in parts per billion as an 8-hour average. The index for each hour is EPA’s: the ozone figure is already the 8-hour average the ozone index is defined on, and the particle figure is run through EPA’s NowCast, which is how an hourly PM2.5 concentration becomes an index.

NOAA’s Hazard Mapping System analysts drew light smoke over Cass County in satellite imagery today (Wed, 7:00 AM CDT to Wed, 10:00 AM CDT). That is smoke seen from above; it is not always smoke at ground level.

NOAA’s model forecasts near-surface smoke peaking at 0.6 µg/m³ around Thu, 3:00 AM CDT.

Smoke on the radar over Cass County

Good

Air quality is satisfactory, and air pollution poses little or no risk.

Who is affected

Nobody is expected to be affected.

What to do

It is a good day to be outside.

Index range

0 to 50

Category descriptions are the Environmental Protection Agency’s own.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

The nearest towns with a page of their own, closest first.

• Linden, TX5 miles
• Atlanta, TX11 miles
• Queen City, TX12 miles
• Hughes Springs, TX17 miles
• Maud, TX18 miles
• Redwater, TX20 miles
• Naples, TX21 miles
• Daingerfield, TX22 miles

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.