Characterizing variations in ambient PM_2.5 concentrations at the U.S. Embassy in Dhaka, Bangladesh using observations and the CMAQ modeling system.

ABSTRACT: We analyze hourly PM_2.5 (particles with an aerodynamic diameter of ≤ 2.5 μm) concentrations measured at the U.S. Embassy in Dhaka over the 2016 - 2021 time period and find that concentrations are seasonally dependent with the highest occurring in winter and the lowest in monsoon seasons. Mean winter PM_2.5 concentrations reached ~165-175 μg/m³ while monsoon concentrations remained ~30-35 μg/m³. Annual mean PM_2.5 concentration reached ~5-6 times greater than the Bangladesh annual PM_2.5 standard of 15 μg/m³. The number of days exceeding the daily PM_2.5 standard of 65 μg/m³ in a year approached nearly 50%. Daily-mean PM_2.5 concentrations remained elevated (>65 μg/m³) for mor

SUBMITTER: Sarwar G 

PROVIDER: S-EPMC10581604 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature