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. Author manuscript; available in PMC: 2022 Feb 1.
Published in final edited form as: J Air Waste Manag Assoc. 2021 Feb;71(2):209–230. doi: 10.1080/10962247.2020.1826366

Table 2.

Summary of PMF model performance in each size fraction (R2 and intercept from base model, mean predicted mass from final rotated solutions).

Measured Predicted* Intercept (% Unexplained Mass)
Size Fraction N Factors Mean (ng/m3) N Obs Mean (ng/m3) R2 Mean (ng/m3) %
PM0.2 6 2,347.6 431 2,167.7 0.63 593.9 25.3
PM2.5 7 14,018.5 250 13,868.5 0.86 679.5 4.8
PM2.5–10 5 11,713.8 295 11,660.7 0.88 33.7 0.3