Association between the concentration of fine particles in the atmosphere and acute respiratory diseases in children.

In summer (( Figure 2 , B), we observed an increasing trend in the number of events and low daily fluctuation in the beginning of the period.

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The mean concentration had high fluctuation, but was relatively uniform throughout the winter ( Figure 2 , C), while in summer ( Figure 2 , D) we observed a decreasing trend in the concentration of PM 2.5 and low fluctuation in almost the entire period.

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