import pandas as pd
dates = ['2015-12-20','2015-09-12']
PM_25 = [80, 55]
dates = [pd.to_datetime(d) for d in dates]
plt.scatter(dates, PM_25, s =100, c = 'red')
s设置大小 c设置颜色
还有很多其他参数：http ://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.scatter
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