Judul: Spillover Effect of Air Pollution and Its Economic Loss in Jabodetabek Urban Agglomeration
Abstrak: High levels of PM2.5 as an indicator of poor air quality represent a prevalent concern in urban agglomerations, and their spatial effects can worsen this issue. As urban centers expand and become more interconnected, the adverse effects of PM2.5 could impede efforts to control pollution and increase public health expenses across regions. This research delves into the influence of spillover PM2.5 levels in Jabodetabek, focusing on the spatial interdependencies. The findings uncover substantial spillover impacts from neighboring cities, revealing an 8.15% rise in PM2.5 levels in a city when surrounding cities experience a 10% increase in PM2.5 levels. This spillover effect has the potential to lead to an average increase in hospital admissions for cardiovascular and respiratory ailments from 13 cities to 95 average admissions and 6 average premature mortality or incur additional health costs of 1.384,911 million IDR and 17.652,38 million IDR of future income losses based on data for 2022. The study also demonstrates that PM2.5 levels in Jabodetabek are influenced by transportation, secondary industrial activities, green spaces, and the frequency of rainy days, with spillover effects originating from these significant contributors. Furthermore, the research indicates that economic growth caused by industrial sector transformation can have a beneficial effect on air quality in the city and its neighboring areas.
Keyword: cost of illness, PM2.5, additional health cost, health cost assessment, spatial effect

Judul: Analisis Status Kualitas Udara Lima Kota Metropolitan di Indonesia.
Abstrak: The air pollution has become environmental quality indicator that impact to citizen health and affect the air quality in that area. The metropolitan city with rapid population rate and higher living standard as well as prosperity level than in rural area caused the increasing of energy consumption and pollutant emission. The aim of this study was to analyse the air quality status and the correlation between air quality and the condition of metropolitan cities in Indonesia namely Jakarta, Bandung, Medan, Surabaya, and Semarang. Secondly, to determine the factor affecting the air quality in those cities. The data were obtained from the State Ministry of Environment, BPS-Statistics, and the other related institutions which were then processed by SPSS program. Based on the analyzed data, the pollutant concentrations were fluctuated from 2007-2012 in those five cities. The positive correlation was occurred between the amount of vehicles and the concentration of PM10, SO2, and NO2, between the population and the concentration of SO2 and NO2, also between energy consumption and SO2. The negative correlation was occurred between the green open area with CO and NO2. Therefore, the factors that affect the air quality in metropolitan cities in Indonesia are population, vehicles, and green open area. Moreover, industrial estate and meteorological factor are allegedly to affect air quality in those cities.
Keyword: air quality, metropolitan city, correlation, Indonesia

Judul: Konstruksi Algoritme Aritmetik GF(3m) dengan Operasi Dibangkitkan dari Sifat Grup Siklik
Abstrak: Perkembangan teknologi informasi memudahkan seseorang untuk mendapatkan informasi yang dibutuhkan. Untuk mengamankan informasi yang sifatnya rahasia diperlukan suatu teknik pengamanan. Teknik tersebut dapat dilakukan dengan mengamankan baik secara fisik maupun non-fisik. Salah satu pengamanan secara non fisik adalah dengan mengenkripsi informasi rahasia menggunakan teknik kriptografi.
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