Each city maintains several fixed-site air monitoring stations dispersed throughout the metropolitan areas that met the quality assurance and quality control procedures of local governments.
The results demonstrate the importance of regionally coordinated measures to improve air quality in metropolitan areas.
The American Lung Association, in its report State Of The Air 2010, finds seven California metropolitan areas with air quality bad enough that they make it onto the list of the Top 10 Dirtiest Cities in America.
Ethanol from sugarcane, produced under proper conditions, is essentially a renewable fuel and has clear advantages over gasoline in reducing greenhouse gas emissions and improving air quality in metropolitan areas.
Population distribution outside the metropolitan area reflects the qualities of the landscape.
Urban expansion consumed high-quality soils in metropolitan regions with low per-capita built-up area, low soil quality index and peri-urban landscapes dominated by forests.
It is these regional -- metropolitan -- economies that foster quality places, vibrant downtowns, attractive town centers and historic, older suburbs that feed the development and acquisition of human capital, financial capital and contribute to efficient, sustainable growth.
"Continued development in areas used by mountain lions adjacent to Los Angeles and other metropolitan areas could reduce the quality of foraging habitat for mountain lions," the study's authors suggest.
There is a growing corporate healthcare industry in the metropolitan cities that provides international quality health services to the people in the country and also serves as hubs for health tourism.
Previous work found the index to be a reliable predictor of travel behavior, physical activity, vehicular safety, and air quality across the metropolitan regions for which values are available (Ewing et al. 2003a, 2003b; Stone 2008; Trowbridge and McDonald 2008).
