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Prevalence of Freshly Generated Particles during Pollution Episodes in Santiago de Chile

Category: Urban Air Quality

Volume: 16 | Issue: 9 | Pages: 2172-2185
DOI: 10.4209/aaqr.2015.12.0691
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Ernesto Gramsch 1, Felipe Reyes2, Yeanice Vásquez2, Pedro Oyola2, María A. Rubio3

  • 1 Physics Department, University of Santiago de Chile, Santiago 9160000, Chile
  • 2 Mario Molina Center for Strategic Studies in Energy and Environment, Santiago 7500000, Chile
  • 3 Faculty of Chemistry, CEDENNA, University of Santiago de Chile, Santiago 9160000, Chile

Highlights

An increase in primary PM2.5 components is seen at night during pollution episodes.
Secondary pollutants, NH4, NO3, SO4, NO2 do not increase at night.
BBOA, an organic component related to wood burning has a large increase at night.
Primary pollutants seem to be responsible for the increase in PM2.5 during episodes.


Abstract

A winter campaign was carried out in Santiago de Chile the year 2012 in two urban sites that can be considered representative for most of the city in order to characterize formation of primary and secondary PM1.0 during episodes. One site is located in the campus of the University of Santiago and measurements were carried out with an Aerosol Chemical Speciation Monitor and a black carbon monitor. Another site is located in a large park, about 2 km south-east of the first site, measurements of CO, NOx, SO2, O3 were done in this site. A noticeable increase in most of the primary components of PM1.0 (black carbon and organics) and primary gases (CO and NO) was observed during days in which the average PM1.0 concentration was higher than 50 µg m–3 (episode). A small increase or no change was observed in the secondary pollutants (NH4, NO3, SO4 and NO2) at night during these episodes. Positive Matrix Factorization was used to extract four components from the ACSM data: hydrocarbon-like organic aerosol (HOA), biomass burning OA (BBOA), low volatility oxygenated OA (LV-OOA) and semi-volatile oxygenated OA (SV-OOA). The freshly generated components (HOA and BBOA) showed a clear increase at night during episodes, while the aged fraction of organic aerosol (LV-OOA and SV-OOA) showed a smaller increase or a decrease at night during episodes. Correlation of HOA and BBOA components with primary pollutants was also high, indicating that freshly created aerosols (HOA, BBOA and BC) are in large part responsible for the increase in pollution at night during episodes in Santiago de Chile.

Keywords

Pollution episode Primary particle Secondary organic aerosol (SOA)


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