It is reported that PM2.5pollution is the main problem( )air pollution today.A.in B.at C.by D.with

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ItisreportedthatPM2.5pollutionisthemainproblem()airpollutiontoday.A.inB.atC.byD.withItisreportedthat

It is reported that PM2.5pollution is the main problem( )air pollution today.A.in B.at C.by D.with
It is reported that PM2.5pollution is the main problem( )air pollution today.A.in B.at C.by D.with

It is reported that PM2.5pollution is the main problem( )air pollution today.A.in B.at C.by D.with
选 D.with
the problem with sth.".的问题" ,这是固定搭配
the main problem with air pollution 空气污染的主要问题
又如:The problem with video game is that they're addictive.
电子游戏机的问题在于它们会使人上瘾.
A serious problem with thermistors is that they tend to drift.
热能电阻的一个严重问题是容易漂移.

选A。in在。。。当中。额。。有人说是withthe problem with表示。。。的问题是...比如：
The problem with “made in china”中国制造的问题

但是你的句子是说PM2.5是大气污染的主要问题所在。我感觉那是大气污染的一种，所以我选的是A。
到底是选with还是in我还真说不准，呵呵。抱歉了...

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选A。in在。。。当中。

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