<P> The Act requires industrial facilities to implement a Leak Detection and Repair (LDAR) program to monitor and audit a facility's fugitive emissions of volatile organic compounds (VOC). The program is intended to identify and repair components such as valves, pumps, compressors, flanges, connectors and other components that may be leaking . These components are the main source of the fugitive VOC emissions . </P> <P> Testing is done manually using a portable vapor analyzer that read in parts per million (ppm). Monitoring frequency, and the leak threshold, is determined by various factors such as the type of component being tested and the chemical running through the line . Moving components such as pumps and agitators are monitored more frequently than non-moving components such as flanges and screwed connectors . The regulations require that when a leak is detected the component be repaired within a set amount of days . Most facilities get 5 days for an initial repair attempt with no more than 15 days for a complete repair . Allowances for delaying the repairs beyond the allowed time are made for some components where repairing the component requires shutting process equipment down . </P> <P> EPA began regulating greenhouse gases (GHGs) from mobile and stationary sources of air pollution under the Clean Air Act for the first time on January 2, 2011 . Standards for mobile sources have been established pursuant to Section 202 of the CAA, and GHGs from stationary sources are controlled under the authority of Part C of Title I of the Act . </P> <P> Below is a table for the sources of greenhouse gases, taken from data in 2008 . Of all greenhouse gases, about 76 percent of the sources are manageable under the CAA, marked with an asterisk (*). All others are regulated independently, if at all . </P>

When the clear air act was revised in 1990 it gave states to comply