Jump to main content.

Projects & Publications

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Lower Rio Grande Valley Transboundary Air Pollution Project (TAPP)

The Transboundary Air Pollution Project (TAPP) was a Border 2012 Program Project conducted in the U.S.-Mexico border region known as the Lower Rio Grande Valley. The study was done because of the Valley community's concerns about the potential health impact of local air pollutants, and lack of local information about air pollution. The approximately $1 million study is the largest air sampling project by EPA to investigate the potential for air pollution to move across the U.S.-Mexican border into South Texas. Air pollution and weather data were collected for a year at three fixed sites close to the border in and near Brownsville, Texas. The study found overall levels of air pollution to be similar to or lower than other urban and rural areas in Texas and elsewhere and that transport of air pollution across the border did not appear to adversely impact air quality on the U.S. side of the Valley. The study also provides a high quality baseline against which future changes in air quality can be compared (e.g., due to increased population and industrialization).

The products from this study, and provided on this web site, include a Project Report (EPA Report No.: EPA/600/R-99/047; NTIS Accession No.: PB99-146938), Project Summary (EPA/600/SR-99/047), Community Summary (EPA/600/S-99/004), and Question and Answer Sheet (EPA/600/F-99-009).

TAPP Documents


Lower Rio Grande Valley Transboundary Air Pollution Project (TAPP): April 1999

71 kb

Figure 2.1. Air monitoring sites 1,2, and 3

22 kb

Section 4: Methods And Quality Assurance

75 kb

Figure 4.1. Locations of the three monitoring stations in the valley.

152 kb

Section 5: Results And Discussion

156 kb

Figure 5.6. Diurnal average of PM2.5 based on hourly TEOM data.

1,695 kb


44 kb

Selected Figures

22 kb


Project Summary - English

35 kb

Project Summary - Español

39 kb



Community Summary - English

32 kb

Community Summary - Español

36 kb

TAPP Map For Revised Project And Community Summaries

TAPP Map For Revised Project And Community Summaries - English

20 kb

TAPP Map For Revised Project And Community Summaries - Español

20 kb


Question and Answer Sheet - English

20 kb

Question and Answer Sheet - Español

23 kb

Border 2012 | Research and Development | Health and Environmental Effects | Technology Transfer Network

Local Navigation

Jump to main content.