Veil of humidity in “Rolling Up the Carpet #9”

At the horizon this picture needed something. It is commonly accepted that at the horizon there should be a fall off of colors, a veil of humidity to some degree, whether it is really there or not to add perspective and mood. I didn’t subdue the trees in the shelter belt enough. Here in the Northern Midwest, we don’t see it very often, and it was not present here, but I feel the effect should be added. The whole picture shouldn’t have the same intensity.
Just about everytime I’ve done Plein Air Painting, I’ve had to improvise on this effect. Our air is very clear! If I went southeast this wouldn’t be a problem.