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Updated: Jun 25, 2025

Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
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How Does Personal Hygiene Influence Indoor Air Quality?

Nijing Wang1, Tatjana Müller1, Lisa Ernle1

  • 1Atmospheric Chemistry Department, Max Planck Institute for Chemistry, 55128 Mainz, Germany.

Environmental Science & Technology
|May 23, 2024
PubMed
Summary

Reduced showering increases skin bacteria emissions and indoor ozone reactions. Skipping showers for 24-48 hours significantly impacts indoor air chemistry and oxidation products.

Keywords:
VOCshuman emissionslotionozoneozonolysisshowerskin

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Area of Science:

  • Environmental Chemistry
  • Indoor Air Quality
  • Human Health

Background:

  • Humans are significant indoor sources of volatile organic compounds (VOCs).
  • The influence of personal hygiene, specifically showering frequency, on indoor VOC emissions and ozone chemistry is not well understood.

Purpose of the Study:

  • To investigate how showering frequency affects human VOC emissions.
  • To determine the impact of reduced personal hygiene on indoor air chemistry, particularly ozone reactions and oxidation product formation.

Main Methods:

  • Controlled climate chamber experiments with four male volunteers.
  • Exposure to ozone-free and ozone-present conditions over successive days.
  • Varying showering frequency (showered, 24h, 48h no shower) and clothing reuse.

Main Results:

  • Decreased showering frequency led to increased emissions of gas-phase carboxylic acids, likely from skin bacteria.
  • Higher ozone levels combined with more days without showering enhanced ozone-skin surface reactions, increasing oxidation products.
  • Skin lotion application altered product yields, decreasing skin ozonolysis products but increasing others.

Conclusions:

  • Personal hygiene practices, like showering frequency, significantly influence indoor air composition.
  • Human emissions and subsequent reactions with ozone are modulated by personal care routines, affecting indoor air quality and exposure.