What was the emission rating in Mid-Atlantic South for the vehicle that was rated 300 g/mi (186 g/km) in the Midwest?
create table table_16105186_2 (mid_atlantic_south__washington varchar, _dc_ varchar, midwest__des_moines_ varchar, PRIMARY KEY (mid_atlantic_south__washington))
select mid_atlantic_south__washington, _dc_ from table_16105186_2 where midwest__des_moines_ = "300 g/mi (186 g/km)"