Open Access Research Paper Views (678) The evaluation of airborne respirable particulates in opencast mining area of Jharia coal field using grimm 1.109 real-time portable aerosol spectrometer Snigdha Kundu, Asim Kumar Pal J. Biodiv. & Environ. Sci. 6(4), 276-287, April 2015. Keywords: Grimm 1.109, PM1, PM10, PM2.5, SEM-EDX Details