Contaminated air refers to air that contains harmful substances, such as pollutants, chemicals, or allergens. These contaminants can come from various sources, including vehicle emissions, industrial processes, and natural events like wildfires. Breathing in contaminated air can lead to health problems, particularly for vulnerable groups like children and the elderly. Common pollutants found in contaminated air include particulate matter, carbon monoxide, and nitrogen dioxide. These substances can cause respiratory issues, cardiovascular diseases, and other serious health conditions. Monitoring air quality is essential to protect public health and the environment from the effects of air pollution.