The concentrations of size-segregated particles were higher during pregnancy and then showed a decreasing trend in the first year of life, with a mean (SD) decrease of 3.9 (6.6) μg/m 3 for PM 1 , 1.9 (6.8) μg/m 3 for PM 1-2.5 , 7.2 (12.2) μg/m 3 for PM 2.5 , 3.5 (10.7) μg/m 3 for PM 2.5-10 , and 10.6 (17.5) μg/m 3 for PM 10 .
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Associations of Early-Life Exposure to Submicron Particulate Matter With Childhood Asthma and Wheeze in China.
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