Significant Cross-Contamination Caused by Cooking Fume Transport between Dwelling Units in Multilayer Buildings.

Cross-contamination in multiunit residential buildings is an inevitable but poorly studied issue. We conducted a 2-month monitoring campaign in a multilayer residential building, identifying 53 interunit kitchen exhaust transmission events (∼2 per day), causing enhanced exposure of particulate matters (PM), black carbon (BC), NO, and CO and volatile organic compounds (VOCs) in both the kitchen and living room. These events resulted in a 40-80% increase in PM deposition in the respiratory systems for occupants in the living room, especially fine particles depositing in the alveolar region.

Multiphase Reaction of Ozone with HONO/NO on Surfaces: Effects on Indoor HONO and Ozone.

Nitrous acid (HONO) and ozone (O) are two important indoor pollutants that affect the indoor oxidation capacity. Previous field studies have observed an inverse correlation between these two pollutants indoors, but the specific mechanism remains unclear. Given the semivolatile behavior of HONO, a possible mechanism is its multiphase reaction with ozone.

The Impact of Indoor Environments on the Abundance of Urban Outdoor VOCs.

With the upcoming transition to clean electric vehicles, the sources of volatile organic compounds (VOCs) in the ambient environment are rapidly changing and highly uncertain. Here, through systematic characterization of emissions from a typical apartment in a Chinese megacity (Shenzhen), we show that indoor environments contribute significantly to the levels of ambient (i.e.

Formation of Nitrosamines from the Heterogeneous Reaction of Nitrous Acid and Organic Amines in Indoor Environments.

Carcinogenic nitrosamines have been widely studied due to their risk to human health. However, the universality and evolutionary processes of their generation, particularly concerning their secondary sources, remain unclear at present. We demonstrated through laboratory flow tube experiments that corresponding nitrosamines were generated from heterogeneous reactions of nitrous acid (HONO) with five structurally diverse amines commonly found indoors, including diphenylamine (DPhA), dibenzylamine (DBzA), dioctylamine (DOtA), -(1,3-dimethylbutyl)-'-phenyl--phenylenediamine (6PPD), and -phenyl-1-naphthylamine (PANA).