Comparison
of plants
All three Midlothian cement plants produce PORTLAND CEMENT
LafargeHolcim
Martin Marietta (formerly TXI)
Ash Grove
TCEQ data on EPA-regulated pollutants for Texas cement plants
20-21EmissionsStats.pdfA LOOK BACK AT LOCAL POLLUTANT EMISSIONS
It's hard to gather data from the TCEQ website, so we've consolidated the emissions history of the Midlothian cement plants below. If you want to explore the source document, go to TCEQ's Point Source Emissions Inventory page, scroll down to "Detailed Data from the Point Source Emissions Inventory" and download the file 2014-2021statesum.xlsx.
Regulated emissions:
CO (Carbon monoxide) | NOX (nitrogen oxide) | Pb (lead) | PM (particulate matter) | SO2 (sulfur dioxide) | VOC (volatile organic compounds)
Things to note:
Since 2019, Martin Marietta has trended up in CO, NOX, SO2 and VOC emissions. Locally, it logged the highest NOX emissions in 2020 and 2021.
Overall, Holcim remains the biggest polluter locally and in the 10-county nonattainment area that includes Ellis, Dallas, Tarrant, Denton, Parker, Wise, Rockwall, Kaufman, Johnson and Collin counties.
MIDLO-EMMISSIONS-HISTORY.pdfHOW THE MIDLOTHIAN PLANTS COMPARE TO OTHER TEXAS CEMENT PLANTS
Things to note:
No other area in Texas has as many cement plants in a concentrated area as Midlothian.
Midlothian's three cement plants logged total pollutant emissions of 10,224 TPY (rounded) in 2021 — more than any other area of Texas.
Holcim had the highest PM 2.5, SO2 and VOC emissions in the state. It had the second highest PM 10 and Pb emissions.
Tx-CementPlnt-PollutantLst-2021.pdfEPA data on greenhouse gas emissions for Texas cement plants
Carbon dioxide (CO2) is a greenhouse gas. Without it, the Earth’s natural greenhouse effect would be too weak to keep the average global surface temperature above freezing. While CO2 occurs naturally in the air, its concentration in our atmosphere has significantly increased due to human activity. While carbon dioxide is not considered a pollutant, it is affecting our welfare. Short and simple — our society is supercharging the natural greenhouse effect, causing the average global temperature to rise.
In 2021, Martin Marietta ranked highest for CO2 emissions by cement plants in the state. Holcim was 5th highest.
Want to explore the source document? Data is compiled from the EPA Flight Tool (Facility Level Information on Greenhouse Gases Tool).
Texas-Cement-CO2List-2021.pdfMap of cement plant locations in Midlothian
Northernmost plant is Ash Grove on the west side of Hwy 67.
LaFargeHolcim is slightly south and east of Ash Grove.
Martin Marietta/TXI is south of 287, near the junction with Hwy 67.
Note that the single TCEQ ambient air monitor was located on Old Fort Worth Road (near Hwy 67). It is upwind from both Ash Grove and Holcim. For the majority of the year, prevailing winds blow NNW. The monitor was taken down in April 2022.
