Assessment of impacts of pm2.5 national roadmap on ambient ozone concentration in Bangkok Metropolitan Region, Thailand | |
| Author | Kantachai Paijityotee |
| Call Number | AIT Thesis no.EV-21-07 |
| Subject(s) | Atmospheric deposition--Environmental aspects--Thailand--Bangkok Air--Pollution--Thailand--Bangkok Particles--Environmental aspects--Thailand--Bangkok Ozone--Environmental aspects--Thailand--Bangkok |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management |
| Publisher | Asian Institute of Technology |
| Abstract | This study aims at assessing impacts of PM2.5 national roadmap on ozone concentration in Bangkok Metropolitan Region (BMR) using the 3D Photochemical Dispersion model. In this study, the BMR domain was set with a grid resolution of 2 x 2 km2 to cover Bangkok and its surrounding five provinces, and the CENTHAI domain was set to cover central and northern parts of Thailand with 6 x 6 km2 . The emission inventory was prepared for the year 2019, including major sources of ozone precursors, and distributed spatially using road networks, hotspots and land-use map. The Weather Research and Forecasting (WRF) model was simulated for two months of dry season (March) and wet season (August), and the simulated results were evaluated with TMD monitoring stations. The emission inventory and simulated meteorology were prepared as the input format for Comprehensive Air Quality Model with extensions (CAMx) to simulate the ozone concentrations. The simulated ozone concentrations were evaluated by comparing with observation data of 9 stations from Pollution Control Department. Emission contribution of ozone precursors in the domain showed that the major sources were on-road mobile source with CO (52.6%), NOx (83.8%) and NMVOC (17.4%). Crop residual open burning contributed 41.1% of CO emission. In addition, Biogenic emission was the major source of NMVOC with 76.4% of total emission. The predicted ozone concentration presented good captures of diurnal variation peaks in hourly ozone concentrations with general underestimate values when compared with US EPA criteria. Mostly, high ozone concentration can be found outside of the city. In this study, the simulation of policy was focused on the existing policies in the national roadmap on PM2.5 of the year 2019 including banning open burning and NGV buses of Bangkok mass transit authority (BMTA) and trucks. The results of the Scenario simulation showed that Scenario 1 can increase average ozone concentration in the eastern part and some parts of northwest by 0.3 ppb, and it also decreased average ozone concentration in the city centers and some western and northern parts. For Scenario 2, it had impacts on increasing average and maximum hourly ozone concentration in both urban and rural areas. |
| Year | 2021 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Environmental Engineering (EV) |
| Chairperson(s) | Ekbordin Winijkul |
| Examination Committee(s) | Nguyen Thi Kim Oanh;Salam, P. Abdul |
| Scholarship Donor(s) | Royal Thai Government Fellowship |
| Degree | Thesis (M. Sc.) - Asian Institute of Technology, 2021 |