Table 2 Indoor to outdoor source contribution ratios (I/O) for each PM size fraction at each house, and as an average across the three houses given.

From: Using low-cost sensors to assess common air pollution sources across multiple residences

 

I/O ratio

H1

H2

H3

Average

PM1

0.08

0.50

0.31

0.30

PM2.5

0.28

1.71

1.07

1.02

PM10

1.22

4.93

4.82

3.66

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