ICF International issued a study August 27 finding that New York City needs more natural gas capacity to help reduce air pollution rates, especially as city buildings make mandatory conversions from heavy heating oil to cleaner fuels. The report, The Assessment of New York City Natural Gas Market Fundamentals and Life Cycle Fuel Emissions, found that the region’s natural gas system operates near its limits during peak periods. It also found that production, transport, and use of natural gas are estimated to result in 20 percent lower greenhouse gas emissions than heavy heating oil.