In the first years, there is the risk of being hit by a car, falling into a pool or pond, or being bitten by a dog (most commonly, the family"s own). The potential perils change with the child"s age: alcohol, drugs, violence and untreated mental health issues can endanger the wellbeing of teens and young adults. Road traffic injuries remain a major risk, too. And then there are the invisible dangers, such as air pollution, which are often especially hard to detect and address.