In a recent work, I'm trying to figure out the pollution situation of my case area. Dealing with the online equipments, I have got the PM2.5 and PM10 concentration time series for a whole year.
I plot their diurnal variation divided by the season.
Although this is a simple data visualization, I think there are some valuable information in the figures. I have found several points that may be interesting, but I can't explain them well.
(1) The diurnal variations of PM2.5 in different seasons are more similar comparing with PM10.
(2) The peak hour in winter for both species are late for 1 hour comparing with other seasons in the daytime.
(3) The concentration levels of both species between daytime and nighttime for spring are more close than other seasons
PS: Some background of the case area
- It is located in northeastern China as a industrial city with lots of metal mining and operation factories.
- The coal combustion behavior is more usual in winter for the need of domestic heating.
- The city is influenced by the dust storms originated from Takla Makan Desert and Gobi Desert.