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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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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