2016 No https://onlinelibrary.wiley.com/doi/full/10.1111/ina.12341 Chua, M. L Asia Experimental Observational Particulate Matter (PM) Bacteria Cardiovascular Corridor environment Cytotoxicity Endothelium Indoor environment Particulate matter (PM) While the total mass of PM collected from indoor environment was lower in comparison with those collected from the corridor, the endotoxin content was substantially higher in indoor PM (e.g., ninefold higher endotoxin level in indoor PM8.1-20). The ability to induce oxidative stress-mediated cytotoxicity and leakiness in cell monolayer were higher for indoor PM compared to those collected from the corridor.