A Step-by-Step Guide to Building a PM2.5 Detector
In recent days, friends from the south have been coming to Beijing to experience the haze, and many have expressed that although the haze in the south is moist and elegant, it cannot compare to the richness and depth of Beijing's haze. I have also heard that the haze in Hebei is rough and bold, but it lacks a bit of cultural depth.
The haze must be appreciated for its accumulation; the old haze of Beijing is indeed thicker than the