Why Mosquitoes Are Attracted to You: The Science Behind Mosquito Magnetism

Mosquito attraction is multifactorial. No single factor determines targeting; it's a combination of cues.

Primary Attractants

1. Carbon dioxide (CO₂): Primary long-range cue. Exhaled plume detected >50 feet. Higher metabolic rate → more CO₂ → more attractive.
2. Body odor / skin volatiles: 300+ compounds. Key attractants: lactic acid, ammonia, carboxylic acids, acetone. Skin microbiome composition drives the volatile profile.
3. Heat / thermal signature: Detected at close range. Higher skin temperature = more attractive.
4. Moisture / humidity: Sweat enhances volatile release.
5. Visual cues: Dark colors (black, navy, red) > light colors. Contrast against the horizon.
6. Movement: Helps mosquitoes lock on.

Individual Variation

• Genetics: Twin studies show high heritability of attractiveness.
• Blood type: Type O > Type A/B (some studies).
• Pregnancy: Increased CO₂ (21%), higher temperature, more skin volatiles → twice as many bites.
• Alcohol consumption: Increases ethanol in sweat and body temperature → more bites.
• Skin microbiome: Unique bacterial communities produce distinct volatile profiles.

Repellent Strategies

• EPA-registered repellents: DEET (20–30%), picaridin (20%), IR3535, oil of lemon eucalyptus (OLE/PMD). Gold standard.
• Clothing: Light-colored, loose, long sleeves and pants. Permethrin-treated clothing (for fabric only).
• Timing: Avoid dawn and dusk (peak activity for many species).
• Environmental: Eliminate standing water (breeding sites). Use screens, fans (disrupt flight).
• Spatial repellents: Metofluthrin devices, coils (outdoor only).

Myths

• ❌ Vitamin B1, garlic, bananas repel — no evidence.
• ❌ Ultrasonic devices — ineffective.
• ❌ "Sweet blood" — not a real concept.

Your mosquito magnetism is largely genetic and microbiomic. Focus on proven repellents and source reduction.