Mosquitoes do not choose people by one simple signal. Female mosquitoes of many species combine carbon dioxide from breath with skin odours, warmth, moisture and visual cues when seeking a host. People produce different mixes of skin odours, which can change how attractive they are to particular mosquitoes.
Mosquitoes combine several cues
Host-seeking mosquitoes can detect carbon dioxide in exhaled breath and use it alongside odours, body heat, moisture and visual contrast. These signals work together: carbon dioxide can help orient a mosquito, while other cues help it assess and approach a nearby person. Which cues matter most depends on the mosquito species and conditions. [1]
Skin odour varies from person to person
Human skin releases a mixture of volatile chemicals. In a controlled study, mosquitoes showed strong and persistent differences in attraction to different people, and higher levels of some skin-derived carboxylic acids were associated with greater attractiveness in that experiment. The finding helps explain why people in the same room can receive different numbers of bites. It does not mean one chemical, blood type or food choice predicts every person’s risk. [2]
The result depends on the species and setting
Different mosquito species respond to different combinations of cues, and a person’s odour can be altered by factors such as skin microbes and recent activity. Air movement, clothing, temperature and nearby hosts also change what a mosquito encounters. A study of one species under laboratory conditions cannot be turned into a universal ranking of who mosquitoes prefer.
What the research can—and cannot—say
Scientists can measure attraction in experiments, but “mosquito magnet” is a shorthand for a relative response in a particular test. It does not identify a single cause for every bite. The most accurate answer is that individual odour profiles interact with mosquito sensing and the surrounding environment. Public-health advice about preventing bites should follow local health authorities, especially where mosquito-borne disease is present.
Sources and evidence
- Cell — Differential Mosquito Attraction to Humans Is Associated with Skin-Derived Carboxylic Acid Levels ↗
Research comparing mosquito attraction to human skin odours and finding an association with carboxylic-acid levels.
- PubMed — Multimodal Integration of Carbon Dioxide and Other Sensory Cues Drives Mosquito Attraction to Humans ↗
Primary research describing how carbon dioxide, odour and heat cues combine in mosquito host-seeking.
Sources consulted: 14 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; claims were checked against the linked primary research.