Articles | Volume 17, issue 22
Atmos. Chem. Phys., 17, 13721–13729, 2017
Atmos. Chem. Phys., 17, 13721–13729, 2017
Research article
17 Nov 2017
Research article | 17 Nov 2017

Aerosol emissions factors from traditional biomass cookstoves in India: insights from field measurements

Apoorva Pandey1, Sameer Patel1, Shamsh Pervez2, Suresh Tiwari3, Gautam Yadama4,a, Judith C. Chow5, John G. Watson5, Pratim Biswas1, and Rajan K. Chakrabarty1 Apoorva Pandey et al.
  • 1Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO 63130, USA
  • 2School of Studies in Chemistry, Pandit Ravishankar Shukla University, Raipur, Chhattisgarh 492010, India
  • 3Indian Institute of Tropical Meteorology, Pune, Maharashtra 411008, India
  • 4Brown School of Social Work, Washington University in St. Louis, St. Louis, MO 63130, USA
  • 5Division of Atmospheric Sciences, Desert Research Institute, Reno, NV 89512, USA
  • anow at: School of Social Work, Boston College, Boston, MA 02467, USA

Abstract. Residential solid biomass cookstoves are important sources of aerosol emissions in India. Cookstove emissions rates are largely based on laboratory experiments conducted using the standard water-boiling test, but real-world emissions are often higher owing to different stove designs, fuels, and cooking methods. Constraining mass emissions factors (EFs) for prevalent cookstoves is important because they serve as inputs to bottom-up emissions inventories used to evaluate health and climate impacts. Real-world EFs were measured during winter 2015 for a traditional cookstove (chulha) burning fuel wood, agricultural residue, and dung from different regions of India. Average (±95 % confidence interval) EFs for fuel wood, agricultural residue, and dung were (1) PM2.5 mass: 10.5 (7.7–13.4) g kg−1, 11.1 (7.7–15.5) g kg−1, and 22.6 (14.9–32.9) g kg−1, respectively; (2) elemental carbon (EC): 0.9 (0.6–1.4) g kg−1, 1.6 (0.6–3.0) g kg−1, and 1.0 (0.4–2.0) g kg−1, respectively; and (3) organic carbon (OC): 4.9 (3.2–7.1) g kg−1, 7.0 (3.5–12.5) g kg−1, and 12.9 (4.2–15.01) g kg−1, respectively. The mean (±95 % confidence interval) OC ∕ EC mass ratios were 6.5 (4.5–9.1), 7.6 (4.4–12.2), and 12.7 (6.5–23.3), respectively, with OC and EC quantified by the IMPROVE_A thermal-optical reflectance protocol. These real-world EFs are higher than those from previous laboratory-based measurements. Combustion conditions have larger effects on EFs than the fuel types. We also report the carbon mass fractions of our aerosol samples determined using the thermal-optical reflectance method. The mass fraction profiles are consistent between the three fuel categories but markedly different from those reported in past literature – including the source profiles for wood stove PM2.5 emissions developed as inputs to receptor modeling studies conducted by the Central Pollution Control Board of India. Thermally stable OC (OC3 in the IMPROVE_A protocol) contributed nearly 50 % of the total carbon mass for emissions from all fuels.

Short summary
This study presents real-world aerosol mass emission factors for traditional biomass cookstoves in India to help constrain regional inventory emissions. Aerosol emissions were sampled from an in-use traditional mud stove burning common biomass fuel types in an Indian household. Measured particulate emission factors and their organic carbon content were higher than those from previous laboratory studies. Field emissions showed a distinct profile of temperature-resolved carbon mass fractions.
Final-revised paper