Avoided health effects and visibility improvements are quantified by comparing two 
If you compared to, you can quantify avoided health effects
Comparing the two is a waste of time and  will not offer information.
She tended to move towards basic aesthetics and original compositions.
Two people in a subway station.
The men are taking a picture together.
That does not match what Dorcas heard.
the guys are fishing
it doesn't mean awkwardness.