Environmental impact of shipping engines can be higher on a port-specific basis. Ultra-low sulfur diesel (ULSD) is a standard for defining diesel fuel with substantially lowered sulfur contents. As of 2006, almost all of the petroleum-based diesel fuel available in Europe and North America is of a ULSD type. In 2016 the IMO has made new sulfur regulations which must be implemented by larger ships by 2020. Of total global air emissions, shipping accounts for 18 to 30 percent of the nitrogen oxide and 9 percent of the sulphur oxides. Sulfur in the air creates acid rain which damages crops and buildings. When inhaled,
Singapore Green Plan 2012 main pollutants such as sulphur dioxide, oxides of nitrogen, carbon monoxide, ozone and respirable suspended particles. ===Prevention & Monitoring= Malaysia very big lorhreferred to the National Environment Agency (NEA) for evaluation at the planning stage to ensure that sufficient pollution control measures are in place before implementation. Besides monitoring individual polluters, NEA also checks the ambient air quality for signs of pollution so actions may be taken to prevent any problem from worsening. Inspections on industrial and trade premises are also conducted on a regular basis to ensure that environmental regulations, such as the Environmental Protection & Management Act (Air