Pencemaran partikulat udara (PM10 dan PM2.5) tidak mengenal batas administrasi wilayah hal ini disebabkan bahwa pencemaran udara tidak hanya berasal dari wilayah lokal namun dapat bertransportasi dari provinsi maupun negara lain. Unsur sampel partikulat yang dikumpulkan di Serpong, Tangerang Selatan selama 24 jam periode tahun 2011 sampai dengan 2013 diidentifikasikan dengan Spekstroskopi Florensensi Sinar-X (XRF). Karekterisasi faktor dilakukan dengan menggunakan reseptor model positive matrix factorization (PMF) dan perkiraan lokasi sumber pencemar menggunakan metode Conditional Probability Function (CPF). Hasil menunjukkan rentang rata-rata konsentrasi massa PM2.5 adalah 12.63 ± 1.60 to 15.89 ± 1.70 μg/m3 sedangkan untuk PM10 berkisar 29.00 ± 3.96 to 31.04 ± 3:28 μg/m3. Multi unsur yang teridentifikasi dengan XRF adalah Al, Ca, Co, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, Pb, S, Si, Ti, V dan Zn. Karakterisasi partikulat halus (PM2.5) teridentifikasi 5 faktor yaitu industri peleburan logam Pb (9.61%), debu tanah (17%), campuran industri peleburan logam dan garam laut (13.02%), trasnportasi (44.36%) serta pembakaran biomassa (22.58%).Kata kunci : polusi udara, spektroskopi XRF, sumber pembagian, fungsi probabilitasbersyarat

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Evaluation and assessment of 232Th, 226Ra, and 40K as natural radioactivity in surface soil in Pasar Jumat Nuclear Facility (PJNA) are important and are a routine activity to monitor the impact of human activities on changes in the level of natural radioactivity in soils. The monitoring data over 7 years period (2012 – 2018) was evaluated to show the time trends, the ratio concentration, and correlation between the outside of PJNA of natural radioactivity level on surface soils. The average radioactivity trend over 7 years monitoring of 232Th, 226Ra, and 40K concentration have varied data. While the mean ratio of 40K/232Th is range from 0.732 to 2.178. The average level of radioactivity concentration at surface soil during the pre-construction, construction, and operation of the MRT project for 232Th, 226Ra, and 40K are 23.34, 21.64, 21.56 bq/kg, then 19.30, 16.73, 18.93 bq/kg, and 27.47, 26.05, 22.26 bq/kg, respectively. The evaluation result state during the MRT project that only the concentration of 232Th on before construction period has a significantly different the mean. There was no influence of MRT construction on surface soil concentration.

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