Salt Lake City is surrounded by mountains, preventing horizontal transport, and has an area of 220km^2. In winter, the city often has problems with pollution due to inversions near the surface. One early winter morning, the inversion height is 0.22 km and the air temperature is -5 C. The pressure is 1 atm. Fugitive emissions of ethane (an ozone precursor) from natural gas pipelines total 1050 kg C2H6. within the city. Assume the air under the inversion is well-mixed. What is the concentration of ethane ( ) in ppbv? MW of H = 1 g/mol; MW of C = 12 g/mol