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Ultrafine particle emissions from essential-oil-based mosquito repellent products.

Liu K; Fung D; Jiang J; Zhu Y

Indoor Air 2014 Jun; 24(3):327-335

https://doi.org/10.1111/ina.12080

20055782

Ultrafine particle (UFP) emissions from three essential-oil-based mosquito repellent products (lemon eucalyptus (LE), natural insects (NI), and bite shield (BS)) were tested in a 386 l chamber at a high air exchange rate of 24/h with filtered laboratory air. Total particle number concentration and size distribution were monitored by a condensation particle counter and a scanning mobility particle sizer, respectively. UFPs were emitted from all three products under indoor relevant ozone concentrations (approximately 17 ppb). LE showed a nucleation burst followed by a relatively stable and continuous emission while the other two products (NI and BS) showed episodic emissions. The estimated maximum particle emission rate varied from 5.4 × 109 to 1.2 × 1012 particles/min and was directly related to the dose of mosquito repellent used. These rates are comparable to those due to other indoor activities such as cooking and printing. The emission duration for LE lasted for 8-78 min depending on the dose applied while the emission duration for NI and BS lasted for 2-3 h.

Ultrafine particles; Air pollutants; Oils; Insect repellents; Particle sizers; Dose response; Ozone; Author Keywords: Indoor Air Quality; Ultrafine particle; Mosquito repellent; Ozone; Secondary organic aerosol; Essential oil

Y. Zhu, University of California, Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, Los Angeles, CA, USA

INAIE5

10028-15-6

20140601

Journal Article

yifang@ucla.edu

Grant

2014

Grant-Number-T42-OH-008412

3

0905-6947

Indoor Air

CA

University of California Los Angeles