Aplikasi Model WRF – Chem dalam Pendugaan Konsentrasi dan Dispersi PM2,5 dan PM10 (Studi Kasus : Kota Bogor tahun 2018)

Abstract

Kota Bogor mengalami peningkatan jumlah kendaraan bermotor setiap tahun. Peningkatan jumlah kendaraan memberi kontribusi yang cukup signifikan terhadap total emisi pencemar di daerah perkotaan dengan konsentrasi utama terdapat di daerah lalu lintas padat. Model WRF-Chem (Weather Research and Forecasting-Chemistry) dapat digunakan untuk mengidentifikasi wilayah yang berpotensi terpapar sebaran pencemar dan mengestimasi pola dispersi serta konsentrasinya. Penelitian ini bertujuan menganalisis pola dispersi pencemar udara di Kota Bogor dan mengestimasi besar polutan PM2,5 dan PM10 dan menggunakan model WRF-Chem. Berdasarkan luaran dari model WRF – Chem, diperoleh konsentrasi maksimum PM2,5 dan PM10 pada bulan Juli jam 00.00 sebesar 77,7 µg/m3 dan 257,2 µg/m3. Berbeda dengan bulan Juli, pada bulan Oktober konsentrasi maksimum PM2,5 dan PM10 dari luaran WRF-Chem terjadi pada jam 21.00 masing-masing dengan konsentrasi sebesar 61,9 µg/m3 dan 205,3 µg/m3. Sebaran PM2.5 dan PM10 bulan Oktober tidak menunjukkan pola yang berbeda dengan bulan Juli. Bulan Juli dan Bulan Oktober menunjukkan polutan terkonsentrasi di bagian utara domain (Kota Jakarta, Kota Bogor bagian Utara, dan Tangerang). Pola sebaran polutan di Kota Bogor sendiri menunjukkan sebagian besar polutan terdispersi ke bagian Utara Kota Bogor.

Bogor City has an increase number of two-wheeled and four-wheeled vehicles every year. Increasing number of vehicles contributes significantly to half of the total pollutant emissions in urban areas with the main concentration being in heavy traffic areas where air pollution levels almost exceed ambient air quality standards. WRF-Chem (Weather Research and Forecasting-Chemistry) model is used to identify potentially exposed areas for pollutant distribution and estimate their dispersion and concentration model. Objectives of this study are analyzing of dispersion model for air pollutants in Bogor City and estimating PM2,5 and PM10 concentration using the WRF - Chem model. Based on the output of the WRF – Chem model, the maximum concentrations of PM2,5 and PM10 in July at 00.00 were 77,7 g/m3 and 257,2 g/m3. In contrast to July, in October the maximum concentrations of PM2,5 and PM10 from the WRF-Chem output occurred at 21.00 with concentrations of 61,9 g/m3 and 205,3 g/m3 respectively. The distribution of PM2,5 and PM10 in October did not show a different pattern from July. The months of July and October showed that the pollutants were concentrated in the northern part of the domain (Jakarta City, North Bogor City, and Tangerang). The pattern of pollutant distribution in Bogor City shows that most of the pollutants are dispersed to the northern part of Bogor City. In the morning, the wind blows from the north to the south of Bogor City.