Why is the air pollution in Shijiazhuang getting worse every day in autumn?

I hope this question can be raised more accurately.

Is the air quality poor in Shijiazhuang in recent foggy weather?

Or is the air quality in Shijiazhuang very poor in history?

If it is the former, serious pollution incidents have occurred in the whole Beijing-Tianjin-Hebei region, including Jinan.

So this question can be used

"Why is there a large-scale air pollution incident with PM2.5 as the main pollutant in North China this time?"

The whole academic community is very concerned about this incident, and there will certainly be many results.

But what can be mentioned now is that this kind of pollution simply comes from man-made pollution discharge and cannot fully explain its causes.

You said there were many cars? The power plant burned a lot of coal? )

It should be noted that air pollution also needs corresponding meteorological conditions and depends on long-distance transportation and chemical mechanism.

We know that in today's global climate change, there are more and more extreme weather events.

So this time, did some calm weather last too long? Because of its influence on human beings (causing serious pollution)

Can it also be defined as an extreme weather event?

Then this proposition is quite interesting.

Of course, this is also inseparable from the public's understanding and concern about air pollution.

In the latter case, some relevant investigations are needed.

I think it's a little rough, so write so much first, and then add more information later.