1. Environmental Officer, Air Quality and Noise Management Bureau, Ministry of Natural Resources and Environment, Bangkok, Thailand.
2. Professor, Civil and Environmental Engineering Dept., Univ. of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2450 (corresponding author).
3. Associate Professor, Civil and Environmental Engineering Dept., Univ. Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2450.
4. Professor, Chemistry Dept., Univ. of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2366.
5. Research Assistant, Chemistry Dept., Univ. of Central Florida, 4000 Central Florida Blvd., Orlando, FL 32816-2366.