ThinkProgress: Thick clouds of heavy smog hung low in Santiago on Monday, a day of exceptional filth in Chiles pollution-stricken capital city. The haze forced more than 1,300 businesses to close after authorities declared an environmental emergency, the first of its kind since 1999. Approximately 80 percent of the citys 1.7 million cars were forced to park, and 100 percent of the citys 7 million people were warned to avoid outdoor activity. The warning was prudent one of the last times this happened, an...