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Cumbrevieja is a volcano located in la palma island. It's an active volcano producing sulfur dioxide gases in atmosphere.

The weekend 25 to 26 of September 2021 air pollution from the volcano arrived to catalonia as you can see in following graph.

The graph was created using matplotlib library in python and the code is below.

Data are obtained from the air pollution website of Generalitat de Catalunya

    import matplotlib.pyplot as plt # It makes accesible all the instructions and codes contained in matplotlib in order to create graphs

x = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48]
  # x data is 48 hours data obtained from generalitat data base corresponding to SO2  in the weekend of interest 
y = [ [2,2,2,3,1,1,1,1,1,1,1,7,23,23,36,37,37,31,23,11,3,2,1,1,2,2,2,2,1,1,1,2,1,2,4,6,4,2,1,1,1,1,1,1,2,4,4,4],
      [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,1,2,1,1,1,1,1,1,1],
      [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,1,1,1,1,1,1,1,1] ]
      # y data are SO2  levels hour by hour in the 3  cities indicated in labels 
labels=['Berga', 'Palau reial', 'Vall de hebron']
colors=['r','g','b']

# loop over data, labels and colors
for i in range(len(y)):
    plt.plot(x,y[i],'o-',color=colors[i],label=labels[i])
plt.title("AIR SULFUR DIOXIDE IN CATALONIA", loc='left')
plt.xlabel("Hours of weekend 25-26/09/2021")
plt.ylabel("SO2 microgram/m3")
plt.legend()
plt.show()