Dear Author,

although most of the comments were satisfactorily addressed, still some issues remain in the manuscript.

The main issue is about the scenario BA1980 as "regional changes of population cannot be considered
as drivers of the emissions happening in the corresponding regions".
In detail from the referee's report:
"Major revisions are required since the BA1980 scenario cannot be used to interpret today’s emission
regional levels as well as to evaluate the impact of emissions control legislation in mitigating air
pollution. The authors might consider to change at least the title and the scope of their publication since
they cannot prove the effect of air quality legislation with their analysis."

I would like the authors to consider the referee's report and change the text accordingly to the
referee's comments, mainly carefully motivating the creation and usage of scenario BA1980.

As additional practical solution, the reviewer nicely suggested "to change at least the title of their paper
since they cannot prove the effect of air quality legislation with their analysis."


Best regards,

Andrea Pozzer

Dear Author,

as you have satisfactorily answered all the comments and reformulated the text to take in account
all the referees' concerns, the manuscript can now be published on ACP.

Please be aware that the sentence
at Page 9, line 8-10 is somewhat hard to follow (missing a verb?) and should
be reformulated.

Thanks and congratulation,

Andrea Pozzer