Photographer Kevin Dooley took this photograph of the sun rising over a polluted Phoenix valley, looking East towards the city of Mesa, Arizona. Phoenix, as About.com notes, has had a growing problem with pollution:
“Since the early 1990s, residents of the Valley of the Sun have been looking for some relief of their own. The “Brown Cloud”, as it has come to be known, shrouds the Phoenix area in pollutants nearly year-round resulting in the American Lung Association giving Maricopa County its lowest grade for air quality in both ozone and particulates in 2005. “
This photograph is from Kevin Dooley who generously shared it via Flickr. It is used on EcoWorld under the Creative Commons license.