Carbon dioxide is the main attractant

Carbon dioxide is what draws mosquitoes to you from a distance, not your blood type or sweat alone. Mosquitoes can detect CO2 from over 50 feet away. That’s the long-range signal that says “living, breathing animal over here.” Once they get closer, other things kick in.

Your blood type plays a role — Type O seems to attract more than A, and Type B is somewhere in between. But that only matters once the mosquito is already in your personal space. Sweat is a mixed bag: lactic acid and ammonia in sweat are attractive, but some people produce natural repellents in their sweat. So it’s not a simple yes/no.

The real hierarchy: CO2 is the dinner bell. Then body heat, then skin odor compounds (including your unique mix of sweat byproducts), and then maybe blood type as a tiebreaker. If you want to stop being a target, reduce your CO2 signature — you can’t stop breathing, but fans help disperse it. Also shower after exercise to cut down on the lactic acid buildup, because that’s the second thing they lock onto.

Basically, you’re a walking CO2 factory. That’s why they find you. The rest is details.