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| Air -- Pollution -- Analysis. (1) |
| Air -- Pollution --- Mexico, Gulf of. (1) |
| Air -- Pollution --- Texas --- Zapata County. (1) |
| Burning of land --- Central America. (1) |
| Burning of land --- Mexico. (1) |
| Smoke plumes --- Central America. (1) |
| Smoke plumes --- Mexico. (1) |
| Transboundary pollution. (1) |