Start of Winter|Winter lowers the temperature. Green Valley lowers the emissions.

Start of Winter

Hide what should be hidden — the cold air, into the north wind; the wheat, into the granary; the black smoke, into the DPF.

Clear what should be cleared — the unburnt, leave it to the DOC to break down; the NOx, leave it to the SCR to turn back into air and water.

Winter lowers the temperature. Green Valley lowers the emissions.