Our national construction code does not require a minimum air leakage rate. (treehugger.com)
Even at a 1.2 percent leakage rate, natural gas companies would emit the same annual amount of greenhouse gases as 32 million cars or 40 coal - fired power plants. (wri.org)
Though the exact leakage rate is uncertain, the negative impacts of methane leakage are clear. (wri.org)