US EPA

3862059 

Journal Article 

The study to estimate the floating population in Seoul, Korea 

Lee, GW; Lee, YJ; Kim, YE; Hong, SH; Kim, SH; Kim, JS; Lee, JT; Shin, DC; Lim, YW 

2017 

English 

28602069 

10.5620/eht.e2017010 

Objectives: The traffic related pollutants have been reported to increase the morbidity of respiratory diseases. In order to apply the management policies related vehicle, the studies of floating population living in cities are important.

Methods: The rate of metro rail transit system by passengers residing in Seoul is about 54 % of the total public transport. Through the using rate of metro, people flow ratios of each administrative area were calculated. By applying a people flow ratio that based on the official census count, floating population in 25 regions was calculated. The reduced level of deaths considering floating population in 14 regions having the roadside monitoring station was calculated as assuming 20 % reduction of the mobile emission based on the policy.

Results: The population size was calculated by applying the hourly population ratio to the regional population as specified in the official census count to estimate the hourly floating population. The number of people moving from 5 a.m. to next day 1 a.m. was not accurate when the population size was applied, but no issue was observed to trigger a shift in the population change sufficiently. The three patterns of increase, decrease, and no change of population in work hours were analyzed. When the concentration of PM 10 was reduced by 20%, the number of excess deaths varied according to the difference of the floating population.

Conclusions: The effective establishment of directions to manage the pollutants in cities should be carried out by considering floating population. Although the number of population using the metro system is only adopted, this disadvantage was supplemented by calculating inflow and outflow ratio of metro users per time in a total floating population in each region. Especially, 54% of metro usage in public transport causes high reliability in application.