In a series of articles on the Athletic by Al Melchior on “Diamond density notes” he describes the difference in Air Density Index (ADI) measured in different ballparks, and the impact that changes in air density experienced by hitters, which he defines as “Visual Memory Index.” He writes:
”The worst-case scenario for hitters is to move from a venue that had low ADIs to one with high ADIs, as it can take them two or three days to adjust their expectations of how much pitches are going to move.”