When is the best season for air quality in Changchun?

First of all, it must be clear that PM2.5 is not the whole measure of air quality, but "one".

There are many methods to evaluate air quality in the world, but at present, the evaluation method in China is a self-created system, mainly for new projects.

Temporarily defined as sulfur dioxide, nitrogen oxides and inhalable particles or total suspended particles; PM2.5 and PM 10 refer to the last item.

If only according to the pollution situation of PM2.5, the best season in Changchun is from mid-late May to early July. During this period, there is more rain, and the particles will be washed away by rain. Once the weather is fine and the temperature is not very hot, it is really cold;

Generally speaking, the period from the middle and late September to the end of 10 is also quite good. Although there is not much rain, I often patronize it. Moreover, it is windy in autumn, pollutants spread quickly and the temperature is relatively cool. So this time is also very pleasant, sorry for those who tend to be "sad about autumn"!

Of course, the air will be much fresher after the snow, but for the period from winter to May 9, the wind is generally not strong, and the diffusion of pollutants is difficult, which is the season with the highest PM2.5 and PM 10. So it was fine just after the snow, but it soon disappeared because of the chimney and tail gas. Other seasons will be much better, specifically because there is no data (Changchun has just started monitoring for a few days) and it is not easy to compare, but the difference is absolutely obvious.