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

Table 3 Statistics for within-sample PM_1.5 increases (see text for formal definition of the ‘increase’ variable)^a

Microenvironment	Mean	25th Quantile	Median	75th Quantile	Max value	% at least 5 μg/m³	% at least 10 μg/m³
Home	24.0	1.6	7.4	19.4	282.1	56.8	40.8
Transit	17.6	1.0	5.3	14.5	269.9	50.4	38.4
School	10.1	1.3	3.2	11.4	137.3	40.8	27.2

^aStatistics were computed by exponentiating 1-min averaged logged concentrations, determining the increase amount within subject samples (subject, day and microenvironment), then computing composite statistics across the 125 samples. PM concentrations (micrograms per cubic meter) have been corrected by gravimetric filter mass collected concurrently with each daily pDR sample

ISSN: 1476-069X