Children are often more vulnerable to environmental hazards than adults.
They may experience higher rates of exposure to pathogens, pollutants and toxins in proportion to their body weight, and have more years of life ahead of them in which they may suffer long-term effects from early exposure. They breathe more air, drink more water, and eat more food per unit of body weight than adults do.
Typical childhood behaviors, such as crawling and putting objects in the mouth, can also lead to increased risks.