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Table 2 Average PM1.5 concentrations by micronenvironment, μg/m3 a

From: Within-microenvironment exposure to particulate matter and health effects in children with asthma: a pilot study utilizing real-time personal monitoring with GPS interface

Microenvironment or time frame Mean Min value 25th quantile Median 75th quantile Max value
Home 12.7 0.2 2.5 5.2 14.3 109.5
Transit 9.2 0.1 2.4 5.3 12.2 61.6
School 6.4 0.1 1.9 3.7 8.1 44.9
Complete sampleb 9.5 0.1 2.2 4.7 11.8 109.5
  1. aStatistics were computed at the subject-day level, not distinguishing between versus within-subject data. Statistics were computed by first determining means within samples (subject, day and microenvironment), then computing statistics across the 125 samples. PM1.5 is particulate matter less than 1.5 μm in aerodynamic diameter. Home, Transit and School microenvironment times are summarized in the text
  2. bApproximately 2:30pm through 11:30am the following day