Source apportionment of indoor PM2.5 at a residential urban background site in Malta

Renato Camilleri, Alfred J. Vella, Roy Harrison, Noel J. Aquilina

Research output: Contribution to journalArticlepeer-review

2 Downloads (Pure)

Abstract

In this study we carry out receptor modelling via Positive Matrix Factorisation (PMF) to identify and quantify the main natural and anthropogenic sources of indoor PM2.5 at an urban background site in the island of Malta. Quartz and PTFE filters were collected, analysed gravimetrically and chemically, using ICP-MS, IC and an OC-EC aerosol analyser to determine the concentrations of PM2.5, 18 elements, 5 ions, organic carbon (OC) and elemental carbon (EC). The EPA PMF was used to identify 8 factors that were affecting the receptor site. Seven outdoor sources were identified: ammonium sulfate (31%), traffic (10%), shipping (10%), sea salt (9%), fireworks (4%), Saharan dust (2%) and industrial (2%). An indoor factor was also identified, which contributed 26% to the indoor PM2.5. Cooking and e-cigarette smoking were identified as the main contributors to the indoor factor. The mean indoor PM2.5 concentration (5.7 μg m−3) at the receptor site was slightly higher than the WHO AQG limit of 5 μg m−3. Uniquely for Malta, we have isolated a fireworks factor for indoor PM2.5. Fireworks have been identified as being responsible for most of the Sb and Ba and hence are of great concern due to the health implications of these toxic elements.
Original languageEnglish
Article number119093
JournalAtmospheric Environment
Volume278
Early online date8 Apr 2022
DOIs
Publication statusE-pub ahead of print - 8 Apr 2022

Keywords

  • Malta
  • Indoor
  • PM2.5
  • Source apportionment
  • Positive Matrix Factorization
  • Fireworks

Fingerprint

Dive into the research topics of 'Source apportionment of indoor PM2.5 at a residential urban background site in Malta'. Together they form a unique fingerprint.

Cite this