Environmental allergens are substances in our surroundings that can trigger allergic reactions in some people. Common examples include pollen from flowers, dust mites found in household items, mold spores from damp areas, and pet dander from animals. When individuals with allergies come into contact with these allergens, their immune systems may overreact, leading to symptoms like sneezing, itching, and difficulty breathing. These allergens can be found both indoors and outdoors. Seasonal allergies often arise from pollen during spring and summer, while indoor allergens like dust and mold can be present year-round. Understanding these triggers can help individuals manage their allergies more effectively.