Rapid modernization and population growth thus created numerous problems associated with heavy industry such as heavy traffic, pollution, the destruction of historic neighborhoods, and a large population of impoverished migrant workers from the countryside. By early 2005, the city government attempted to control urban sprawl by restricting development to two semicircular bands to the west and east of the city center, instead of the concentric rings of suburbs that had been built in the past.
The rapid growth of population, motor vehicles and factories has created high polluation levels. Days with gray, acrid skies, with an eye-reddening pollution score over 400, are common, as health officials advise wearing masks and staying indoors. Heavy trucks are allowed in only at night but their diesel fuels create much of the problem. By 2008 for the city’s 12 million residents, pollution was not only an inescapable health and quality-of-life issue, but a political issue tied in with the Summer Olympics scheduled for August 2008. The city’s bid for the 2000 Olympics in 1993 failed partly because of high pollution levels, and in response the city began a massive cleanup campaign. That campaign has been successful in terms of 2000 standards, but the city’s economy is 2.5 times larger now, with millions more people. Over 3 million cars and trucks clog the streets, and 400,000 more are added annually as the wealth shoots up rapidly. Old dirty, coal-burning furnaces have been replaced, lowering the city’s sulfur dioxide emissions. Factories and power plants were changed to burn cleaner, low-sulfur coal; sulfur dioxide emissions fell by 25% 2001-2007, even though much more coal is burned, reaching 30 million tons in 2006.
Furthermore, fine-particle pollution has been exacerbated by a staggering citywide construction program which saw more than 160 million square meters (1.7 billion square feet) of new construction begun 2002-2007. Athletes may have some breathing problems, but in the long-run air quality is expected to remain a critical issue as the city grows to a projected population of 20 million. National Hard Money Association Conference
