Dogs and Indoor Air Quality: New Insights from Recent Research

A recent study published in the journal *Environmental Science & Technology* reveals that dogs significantly influence indoor air quality by releasing airborne particles, gases, and microbes. Conducted by researchers at the Human-Oriented Built Environment Laboratory in Lausanne, Switzerland, the study examined both small and large dogs to understand their contributions to indoor air pollution. The findings indicate that dogs can emit pollutants at levels comparable to, and in some cases higher than, those produced by humans.

UsNews and World ReportBig and small dogs both impact indoor air quality, just differently

The research involved a controlled laboratory setting where emissions from four small Chihuahuas and three large dogs—specifically a Tibetan Mastiff, a Newfoundland, and an English Mastiff—were measured alongside those of their human owners. The study found that large dogs emitted carbon dioxide and ammonia at rates similar to humans, while small dogs produced a higher volume of airborne particles, likely due to their increased activity levels during the tests. Notably, larger dogs released more bacteria and fungi into the air, many of which were traced back to outdoor environments, thus altering the indoor microbial landscape.

Big and small dogs both impact indoor air quality, just differentlyUsNews and World Report

The study's authors emphasize the importance of considering pet emissions when designing ventilation systems and air quality control measures. Dusan Licina, the lead researcher, stated, “By quantifying what dogs add to indoor air, we can build more realistic indoor air quality and exposure models and better inform ventilation strategies.” This perspective aims to promote pet ownership without compromising indoor air quality.

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The researchers also plan to extend their investigations to other pets, such as cats, rabbits, and rodents, to further understand their impact on indoor air quality. This research is particularly relevant for pet owners who spend significant time indoors, as it highlights the dual role of pets in enhancing mental well-being while also affecting physical health through air quality.

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The study's findings have garnered attention for their implications on indoor air quality management. Licina noted that dogs act as "mobile transport vectors," carrying particles and microbes from outdoor environments into homes. The authors advocate for integrating pet emissions into air quality assessments to foster healthier indoor environments for both humans and animals.

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While the study provides valuable insights, some critics may argue that the focus on pet emissions could lead to unnecessary concerns among pet owners regarding indoor air quality. However, the researchers aim to inform rather than alarm, emphasizing the need for balanced ventilation strategies that accommodate both pets and humans.

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• “By quantifying what dogs add to indoor air, we can build more realistic indoor air quality and exposure models and better inform ventilation strategies — without blaming pets or discouraging pet ownership,” — Dusan Licina, Researcher

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• “Pets are part of our indoor environment.” — Dusan Licina, Researcher

Big and small dogs both impact indoor air quality, just differently

Future research will explore the emissions from various other pets, expanding the understanding of how different animals contribute to indoor air quality. This ongoing investigation aims to refine ventilation strategies and improve health outcomes for households with pets.

Big and small dogs both impact indoor air quality, just differently