CREATE TABLE table_20552 ("Vehicle" TEXT, "EPA rated All-electric range" TEXT, "EPA rated combined fuel economy" TEXT, "Alaska  (  Juneau  ) " TEXT, "California  ( San Francisco ) " TEXT, "Mid-Atlantic South  ( Washington ,  D.C. ) " TEXT, "U.S. national average electric mix" TEXT, "Southeast  ( Atlanta ) " TEXT, "Midwest  ( Des Moines ) " TEXT, "Rocky Mountains  ( Denver ) " TEXT)

What was the emission rating in Mid-Atlantic South for the vehicle that was rated 300 g/mi (186 g/km) in the Midwest?
SELECT "Mid-Atlantic South (Washington, D.C.)" FROM table_20552 WHERE "Midwest (Des Moines)" = '300 g/mi (186 g/km)'
SELECT "Mid-Atlantic South (Washington, D.C.)" FROM "table_20552" WHERE "Midwest (Des Moines)" = '300 g/mi (186 g/km)'