AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Insights on Aerosol Emissions during HOMEChem
SAMEER PATEL, Sumit Sankhyan, Yilin Tian, Allen Goldstein, Delphine K. Farmer, Marina Vance, University of Colorado Boulder
Abstract Number: 580 Working Group: The Air We Breathe: Indoor Aerosol Sources and Chemistry
Abstract In the US, people spend about 90% of their time in indoors1, and indoor PM2.5 exposure has been estimated to account for more than a quarter of fine particulate matter (PM) mortality burden highlighting the importance of focusing more on IAQ in the developed world2. Much of indoor PM exposure—in addition to outdoor penetration—is due to indoor activities such as cooking. Aerosol emissions from cooking are relatively less investigated in developed countries compared to developing countries which rely on solid fuels for cooking and space heating.
We conducted an indoor chemistry field study titled HOMEChem (House Observations of Microbial and Environmental Chemistry). IAQ in a three-bedroom, two-bathroom 110 m2 manufactured test house was comprehensively characterized while everyday activities such as cooking, cleaning, and opening doors and windows were performed. PM0.1 and PM2.5 exceeded 100 µg m-3 and 300 µg m-3, respectively, during some cooking events. Estimated mass of PM deposited in the respiratory system of an adult residing in the test house during a experiments simulating a routine day (breakfast, lunch, and dinner followed by cleaning activities) and a typical Thanksgiving meal preparation were almost nine times (62.3 µg) and 17 times higher (129 µg), respectively, compared to a day with no activities (7.4 µg).
The formation and growth of sub-30 nm particles were observed after mopping the floors with bleach but only when a specific type of meal preparation preceded mopping. Such observations indicate particle formation governed by the chemistry between certain species originating from both cooking and cleaning.
[1] Klepeis et al. (2001), Journal of Exposure Science and Environmental Epidemiology. [2] Azimi and Stephens (2018), Journal of Exposure Science & Environmental Epidemiology.