• Sit for a spell under a cottonwood tree and view the Franklin Mountains, seemingly nestled between the U.S. and Mexico flags in front of the visitor center. The two flags reflect our heritage; this land once belonging to Mexico and now to the U.S.


    National Memorial Texas

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  • New Hours!

    Beginning October 1, the grounds of the memorial will be open to the public from 7 a.m. to 10 p.m. This applies to all foot traffic and vehicles. For questions, call (915) 532-7273.

  • ¡Horario Nuevo!

    A partir del 1ero de octubre, se abren los terrenos del parque desde las 7 a.m. hasta las 10 p.m. Esto vale para el tráfico peatonal igual al de vehículos. Si tiene preguntas, llame al (915) 532-7273.

  • Phone System Problems

    We are currently experiencing problems with our automated phone system. For general information or to speak to someone in the visitor center, please dial 915-532-7273, extension 113, between 10 am and 5 pm. We apologize for any inconvenience.

  • Problemas Telefónicos

    Actualmente existen problemas con el sistema telefónico. Para información general o para comunicarse con el centro de visitantes, marque 915-532-7273, extensión 113 entre las horas de 10 am y 5 pm. Disculpe la molestia.

Air Quality Monitoring

TCEQ Air Quality Monitoring Station
This air quality monitoring station is situated in our southwest corner, by our "dirt lot" parking area.
A peak inside

A look inside the site reveals multiple instruments that take in air, record measurements, and help our nation’s lawmakers make informed decisions.


When you visit Chamizal, you may come across this fenced-in building. Many visitors wonder what it is but few ask. Since 1988, Chamizal has been the site of an ambient air quality monitoring station that the Texas Commission on Environmental Quality (TCEQ) maintains in partnership with the City of El Paso. There are many monitoring stations throughout the state of Texas. Visit http://gis3.tceq.state.tx.us/geotam/ to view an interactive map of ambient air quality monitoring stations across Texas. The site here at Chamizal isn't the only El Paso station. UT El Paso, the Lower Valley, West El Paso and East El Paso all have active stations as well.

What are they measuring?
This ambient air monitoring station continuously monitors atmospheric gases for ozone, carbon monoxide, sulfur dioxide, nitrogen oxides, and total reactive nitrogen. Hydrocarbons, such as benzene, propane, and toluene, (air pollutants) are also continuously monitored. Atmospheric conditions and meteorological measurements (wind direction, wind speed, dew point, and solar radiation) are recorded. The data collected from these measurements are stored on-site and automatically uploaded to TCEQ's data collection, processing, and storage systems.

In addition, filter-based instrumentation is collected by an operator, and then analyzed in a laboratory before being uploaded to TCEQ. The filters collect airborne particulates (tiny pieces of solids or liquids that are naturally occurring or manmade). One filter continuously collects particles that are 2.5 – 10 microns thick, or smaller than a grain of sand. Another filter collects periodic samples 2.5 microns or smaller. Many particulates of this size are so small they can be inhaled, and passed from your lungs into your bloodstream.

Particulate Matter Collection

Particulate matter sampler collection inlet


How is this data useful?
The data collected here at the Chamizal site has been, and continues to be, used to provide the public with the most up-to-date information on air pollution. This information helps to characterize the nature and extent of air pollution, determine trends in pollution concentration levels, and supports compliance with the National Ambient Air Quality Standards (NAAQS). The site also gathers information that enhances studies on air pollution's impacts on human health and the health of our environment and ecosystems, as well as assesses emissions and pollutants reduction strategies and programs.

Chamizal isn't the only National Park site to partner with TCEQ. Big Bend National Park also houses a station, the IMPROVE air monitoring site. There, TCEQ collects continuous filter-based particulate samples and meteorological data.

Data collected from the sites are available to the public. Most of the continuous data may be found online and is updated hourly. Non-continuously collected data, or data that must first be analyzed in a laboratory, is updated online after review and verification. Information about the site, the monitoring, and links for accessing the data are available on the TCEQ website.

The National Park Service of the United States has several missions to fulfill. Here at Chamizal National Memorial, we celebrate the cultural diversity of our borderland area as well as cultures around the world. As a part of El Paso's history, it is our mission to teach the public about international cultures. As part of the National Park Service, it is also our mission to promote active research and monitoring of the amount and effects of air pollution, as well as to educate the public in the importance of clean healthy air. Chamizal has actively chosen to partner with the state of Texas and TCEQ. Many other national parks maintain internal or regional teams of scientists who monitor air quality. For more information on these teams, check the NPS Air Quality website.

Did You Know?

Chamizo Plant

Chamizal National Memorial is named after a plant. Chamizal means "land where the chamiso grows". The Spanish word "chamiso" is the common name for four-wing saltbush (atriplex canescens). More...