Several environmental toxicants are of concern due to their widespread presence and potential health effects. These include heavy metals like lead and mercury, which can cause neurological damage. Pesticides, such as organophosphates, are another group of toxicants that can affect the nervous system. Additionally, air pollutants like particulate matter and ozone are associated with respiratory and cardiovascular diseases. Understanding the sources and effects of these toxicants is crucial for developing strategies to minimize exposure.