Figure 4. Carbon Monoxide Levels Dropped in March and Remained Low in April and May
Percent change of CO average concentrations in 2020, compared to 2010-2019 averages
Created with Raphaël 2.1.2
0%
X
−50%
−40%
−30%
−20%
−10%
−10%
Feb 25
−39%
Mar 25
−55%
Apr 25
−57%
May 25