Operations, like mining and truck traffic, are some of the top causes of air pollution. These activities release carbon monoxide, sulfur dioxide and nitrous oxide into the air, all of which contribute to development of smog and various health problems.
King of Prussia Information. Time Zone. Abbreviation / Name. EDT - Eastern Daylight Time. EST - Eastern Standard Time. UTC / GMT Offset. -4:00 hours during Eastern Daylight Time, currently in use. -5:00 hours during Eastern Standard Time.
Alaska and Hawaii have their own time zones: Alaska Standard Time (AKST) and Hawaii Standard Time (HST) respectively. Daylight Saving Time began for most of the United States at 2 a.m. on the second Sunday of March. Time reverts to standard time at 2 a.m. on the first Sunday of November. Eastern Standard Time (EST), the time zone New York is in, which is 5 hours behind Greenwich mean Time (GMT). 2  Central Standard Time (CST), the time zone Chicago is in, which is 6 hours behind Greenwich Meantime (GMT). 3  Mountain Standard Time (MST), which is 7 hours behind Greenwich Mean Time (GMT).