Evergreen trees, such as pines, firs, and spruces, produce pollen in the spring. This pollen is released into the air to fertilize female cones on the same or other trees. The pollen is typically yellow, but can vary in color depending on the species of tree.

It's important to note that pollen is a common allergen, and can cause seasonal allergies in some people. If you're sensitive to pollen, you may experience symptoms like sneezing, runny nose, itchy eyes, and congestion during the spring.