had become an independent municipality in 1826. Industrialization began here with the founding of the Hilados and Tejidos de Rio Hondo factory, inaugurated by Benito Juarez in 1869. In 1899, the territory of Santa Cruz del Monte was added to the municipality. During the Mexican Revolution, Zapatista leaders Rafael Carrillo and Roman Diaz operated in the nearby Chimalpa mountains against federal forces. The Toreo de Cuatro Caminos was inaugurated in 1947. It was the icon of the city for many years, as well as the symbol of Naucalpan's Metro station, Cuatro Caminos. The building was torn down in 2009 to make way for a commercial complex. Naucalpan was officially declared a city in 1957, and the founding of Ciudad Satélite occurred in the same year. The project was completed in 1963. Its five signature towers were designed by Luis Barragán and Matias Goeritz. By 1975, Naucalpan had become one of the most industrialized cities in Mexico. The city The city of Naucalpan extends into neighboring Huixquilucan Municipality. At the 2010 census its total population was 913,681 inhabitants, with 792,211 of these in Naucalpan Municipality and 121,470 in Huixquilucan Municipality. Since cities, or localities, have no separate government, the two parts are governed from their respective municipalities. Within Naucalpan Municipality only the Los Remedios National Park and several ejidos remaining mostly unurbanized. Over 95% of the municipality's population lives in the city proper. The municipality consists of 119 neighborhoods in the city proper, 18 small villages, 71 residential developments and two rural housing developments. Because of the growth of its industry, Naucalpan is one of the most important municipalities in the country. Products manufactured here include foodstuffs, drinks, tobacco, clothing and textiles, wood products and paper, metals and chemicals. Industrial parks include Alce Blanco, Atoto, Industrial Naucalpan, La Perla and Tlatilco. The municipality is part of Greater Mexico City and in the Valley of Mexico, sharing the air quality and other environmental problems that are prevalent in this region. Naucalpan already participates in the "Hoy No Circula" program, which restricts the use of private automobiles in Mexico City and some adjoining areas during the week and is considering extending restrictions to Saturdays as well. Its subsoil is considered to be gravely polluted, mostly due to the Bordo Poniento landfill and the sinking of the subsoil due to the over pumping of groundwater and the dumping of untreated wastewater. In addition, many