MPPD	Multiple path particle dosimetry
PM	Particulate matter
PM2.5	Particulate matter with aerodynamic diameter less than 2.5
IGP	Indo-Gangetic Plains
COPD	Chronic Obstructive Pulmonary Disease
NCT	National Capital Territory
CSIR-NPL	CSIR-National Physical Laboratory
PTFE	Polytetrafluoroethylene
SEM	Scanning Electron Microscopy
EDS	Energy Dispersive X-ray spectroscopy
WD-XRF	Wavelength Dispersive-X-ray Fluorescence
OP-FTIR	Open Path-Fourier Transform Infrared Spectroscopy
MIR	Mid-infrared
MCT	Mercury Cadmium Telluride
IMD	India Meteorological Department
HRT	Human respiratory tract
TB	Trachea-bronchial
P	Pulmonary
FRC	Functional residual capacity
URT	Upper respiratory tract
USEPA	United States Environment Protection Agency
ADD	Average daily dose
WHO	World Health Organization
NAAQS	National Ambient air Quality Standards
RH	Relative humidity
%	Percentage
NIST	National Institute of Standards and Technology