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Frequency of high ratio events at different bins of (separated by 0.1) neutralization ratio from (a) eastern (177 sites), (b) central (88 sites), and (c) western (63 sites) regions. The regions were separated based on time zone i.e. east region means the sites from eastern time zone, central from central time zone, and west from pacific and mountain time zones. Grey dashed line illustrates the completely neutralized aerosol.
