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Concentrations of PM2.5 inside the stations were 30 40% higher at EDB than outside and up to 20% higher at KGX. 10.1001/jamanetworkopen.2020.4031 DO 10.1001/jamanetworkopen.2020.4031 M3 Article VL 3 SP e204031 JO JAMA network open JF JAMA network open SN 2574 3805 IS 4 ER TY BOOK T1 Building Digital Technology Capacity