* Corresponding authors

^a Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843, USA
E-mail: yuezhang@tamu.edu
Fax: +1 (979) 862-4466
Tel: +1 (979) 862-4401

^b Zachry Department of Civil & Environmental Engineering, Texas A&M University, College Station, TX 77843, USA

^c Picarro Inc., Santa Clara, California 95054, USA

^d Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC 27599, USA

^e Aerodyne Research Inc., Billerica, MA 01821, USA

^f Department of Civil, Environmental, & Construction Engineering, Texas Tech University, Lubbock, TX 79409, USA