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Hoy No Circula (literally in Spanish: "today it (car ) does not circulate", known as No-drive days) is the name of an environmental program intended to improve the air quality of Mexico City. A similar coordinated program operates within the State of México, which surrounds Mexico City on three sides. Mexico City and Mexico State have reciprocal agreements with surrounding states that also have emissions testing programs to permit their residents to travel freely without restriction. The following restriction does not apply to vehicles that have other than 0 or 00 sticker (permits driving every day without restriction) and are plated in Mexico City, Mexico State and surrounding states that have an agreement with Mexico City and Mexico State. It is based on the last digit of their license plate. There are other restrictions that are applicable to non-local vehicles and foreigners, which are presented in the remainder of this article. The hours of the program are from 5 A.M. to 10 P.M. Emissions testing is conducted every 6 months. ==History== Hoy no Circula was started in late 1989, and consisted of prohibiting the circulation of 20% of vehicles from Monday to Friday depending on the last digit of their license plates (see table). The program was planned to apply only during the winter, when air pollution is at its worst. Winter follows the rainy season when thermal inversion, an atmospheric condition which traps smog and pollution close to the ground, increases air pollution noticeably. However, the program was made permanent at the end of the 1990 winter season. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hoy No Circula」の詳細全文を読む スポンサード リンク
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