Dogs influence the air quality in homes. A study from Lausanne has measured for the first time the gases, particles and microbes that four-legged friends bring indoors. +Get the most important news from Switzerland in your inbox The researchers see the results as a basis for more realistic models of indoor air, the Swiss Federal Institute of Technology Lausanne (EPFL) said on Monday. The influence of humans on the air has been well researched. However, the researchers say that the impact of pets has hardly been considered to date. According to the study, a large dog at rest emits about the same amount of CO2 as an adult human. The amount of ammonia emitted is also comparable. This gas is produced when proteins are broken down and is released via the skin and the air we breathe. According to the data, however, dogs had the greatest influence on particles in the air. By shaking, scratching or stroking, they stir up large quantities of dust, pollen, plant residues and microbes. Large ...