Portland cement is not only produced and consumed domestically, but is also traded internationally. In 2005, the U.S. imported 37 million short tons (34 million metric tons) of cement . The level of imports to the U.S. is cyclical with domestic producers importing more when domestic plants are operating at full capacity and cannot meet the remaining demand. Historically, imported cement and clinker have accounted for 20-27% of the domestic consumption of cement. In 2005, total imports of cement and clinker rose owing to continued high demand and accounted for about 24% of the total cement sales in the U.S. .
1 Class I areas are those of special national or regional natural, scenic, recreational, or historic value for which the Prevention of Significant Deterioration (PSD) regulations provide special protection.
The ten leading countries supplying cement and clinker to the U.S. in 2005 were, in descending order, Canada, China, Thailand, Greece, the Republic of Korea, Venezuela, Mexico, Colombia, Taiwan, and Sweden. The ten busiest customs districts of entry in 2005 were, in descending order, New Orleans, LA; Tampa, FL; Los Angeles, CA; Houston-Galveston, TX; San Francisco, CA; Miami, FL; Seattle, WA; Detroit, MI; New York, NY; and Charleston, SC .
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