Irritants are substances that can cause discomfort or inflammation when they come into contact with the skin, eyes, or respiratory system. Common examples include pollen, dust, and chemical fumes. These irritants can trigger allergic reactions or exacerbate conditions like asthma, leading to symptoms such as sneezing, itching, or coughing. In everyday life, irritants can be found in various environments, including homes, workplaces, and outdoor areas. Household cleaners, smoke, and pet dander are typical indoor irritants, while outdoor irritants may include air pollution and mold. Reducing exposure to these substances can help alleviate symptoms and improve overall health.