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. 2022 Dec 23;864:161152. doi: 10.1016/j.scitotenv.2022.161152

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Fig. 5 — Post-factum early warning methods MSD and PER, based on N1 (gc/L) and N1/c (gc/L/case), respectively.

a. Early warnings identified by MSD (N1, gc/L) with Method I defined

b. Early warnings identified by MSD (N1, gc/L) with Method II defined

c. Early warnings identified by MSD (N1, gc/L) with Method III defined

d. Early warnings identified by PER (N1, gc/L/case) with Method I defined peaks

e. Early warnings identified by PER (N1, gc/L/case) with Method II defined peaks

f. Early warnings identified by PER (N1, gc/L/case) with Method III defined peaks.