Secondary Pollutants from VOCs in Urban Indoor Air
Abstract
People spend most of their time in indoor environment. Volatile organic compounds
(VOCs) are commonly found in indoors due to the presence of several indoor
sources. Besides, outdoor VOCs, when infiltrate into the indoors, increase indoor
levels of VOCs. Some studies have reported that VOCs in indoor air may be involved
in the production of secondary pollutants. This study investigates the role of VOCs in
forming secondary air pollutants and identifies the critical environmental factors,
which favor the reactions. It was found that VOCs form secondary organic aerosols
(SOAs), which remain in particle form in the ultrafine size range. In this, pollutants
like ozone (O3), oxides of nitrogen (NOx) and hydroxyl radicles (OH) take part. SOA
constitutes major portion of particulate matter in indoors and as it has fine size, it is
suspected to cause severe health effects. The article is, therefore, focused on the
importance and challenges that SOAs pose to indoor environment. Mitigation
measures and research gaps are also discussed.
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