Prof. Mujibor Rahaman : IAGR Conference 2024
Prof. Mujibor Rahaman, Professor, Department of Environmental Science, Khulna University
Professor Dr Md Mujibor Rahman, HoD, Environmental Science Discipline, Khulna University, Bangladesh having PhD in GIS application, received PGD and LIS Training course from Indian Institute of Remote Sensing (IIRS) Dehradun India. Also completed PG and UG in Geography and Environmental Studies, supervised several number of PhD, Master and UG students. Attending various national and International seminar and conferences home and abroad and also published more than 100 articles in national and international level and 15 book chapters in international level and attended more than 100 seminar/conference/symposium in national and international level.
Title of Talk:
Assessment of the Intricate Relationship between Urban Heat Island (UHI) and Air Pollutants in Dhaka City, Bangladesh
Abstract
Increasing air pollution is a severe thing for Dhaka city, while for global warming, the temperature of this city is also reaching new heights every year. That is why this study seeks to determine the relationship between air pollutants and temperature. Air pollutants and Temperature both is an atmospheric phenomenon which associate each other, proven by the past studies. This study tried to assess the urban heat island of Dhaka city in seasonal and yearly variable, pollution concentration and also influencing factors at the same time. Statistical correlation analysis had been run to find out the relationship between air pollutants and temperature by using Land Surface Temperature (LST) and Air Quality Monitoring data. For assessing the influencing factor, five parameters have been selected for this study. Land surface temperature, normalized difference vegetation index, population, power consumption or energy use, built up areas are selected for the influencing factors. With Urban Heat Island Intensity of daytime and nighttime in summer season and winter season and yearly average urban heat island variability, and six air pollutants of NO2, SO2, CO, O3, PM 2.5, PM 10 in Dhaka city during 2013-2019, correlation analysis was conducted. The study shows that the annual average NO2, SO2, CO, O3, PM10, and PM2.5 concentrations were 15.998 ppb, 10.687 ppb, 1.811 ppb, 6.139 ppb, 146.221 ppb, and 83.715 ppb respectively. A strongly significant negative correlation has been seen between Daytime Urban Heat Island Intensity (UHII) in summer and PM2.5 with 0.003 significance. Another negative correlation has been observed between Nighttime UHII in summer with 0.033 significance level. For the winter season, daytime UHII is positively correlated with PM10 at 0.011 significant level and nighttime UHII is strongly significant with O3 at 0.007 level. The daytime UHII variability is in significant correlation with SO2 with 0.31 significance. The nighttime UHII variability has no relation with the air pollutants. For influencing factors, only one influencing factor has found to be approximately 56% of the variability in NO2 concentrations can be explained by changes in LST. But when the analysis has been done for the specific location source, it is found that approximately 51% of the variability in PM2.5 concentrations at Farmgate area can be explained by changes in LST and approximately 79% of the variability in PM2.5 concentrations at Farmgate area can be explained by changes in NDVI. This finding will help in the policymaking of the urban area to mitigate both heat island and air pollutant at the same time.
Key Words: heat island, vulnerability, mitigate, hazards and concentrations.
