Francis pollen is a tiny, powdery substance that comes from flowers and plants. It is so small that you cannot see it with your eyes, and it can float in the air.
When you breathe in air that has Francis pollen in it, some people's bodies may think it is harmful, like a germ or virus, and start to fight it. This can make you feel itchy, sneezy, and cause your eyes to water. This is called an allergy.
That's why some people might sneeze or have a runny nose when they are outside during the spring or summer when flowers are blooming and making more pollen.
It's also why sometimes people take medicine or use special kinds of air filters to help make them feel better when they are around Francis pollen.