Table 2 Similarity angle between mass spectra of different factors obtained based on PMF and ME2 methods in different seasons

From: Comparative analysis of methods for seasonal particulate organic nitrate estimation in urban areas

angle θ

Spring

Summer

Autumn

COA

14.02°

4.92°

3.42°

HOA

14.36°

16.96°

9.4°

LO-OOA

5.88°

28.93°

1.28°

MO-OOA

3.38°

29.24°

14.48°

NIA

0.42°

6.43°

1.81°

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