We affect our environment, and our environment affects us. Humans are connected and a part of their natural environment. When we think of the environment and how it impacts health, we tend to think of the earth and our natural environment - the air we breathe, the water we drink, the food we eat. However, we may also spend a great deal of time in our homes, at work, in school, or in other buildings. We breathe indoor air, and consume or use household products, cosmetics, and medicines. Environmental hazards may include any chemicals or toxins we come into contact with on a daily basis that can cause harm. An example would be lead paint in the home or particulate matter in outdoor air. The presence of a hazard does not necessarily mean that health problems will occur, but it may cause a disease or other health problem. To learn more about a specific environmental contaminant, enter a search term at the Agency for Toxic Substances & Disease Registry's (ATSDR's) Toxic Substances Portal.