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A Snapshot of the Border
million in 1990 to 3.7 million in 2000, during the decade of rapid
economic and population growth (Figure 2). In 2000, just more
than 1.3 million vehicles were registered in Mexican border cities
(Figure 3). A significant source of mobile air pollution is emissions
from vehicles delayed at the border for inspection and for general
entry into the country. Truck crossings at Texas border towns have
increased since 1990, particularly at Laredo (Figure 4).
Vehicles
Figure 2. Vehicles in Mexican Border States
3,700,000
3,500,000
3,300,000
3,100,000
2,900,000
2,700,000
2,500,000
2,664,598
1990
1991
1992
1993
Source: Sistema Municipal de Baso de Data
41
1994
Year
1995
1996
1997
1998
3,661,970
1999