05/10/2022
As of 2022, over 54% of the US population had a blood lead level above the 5-µg/dL threshold for “safe” exposure as children. This is primarily due to the presence of leaded paint in homes built before the 1970s, contaminated soils from man-made and natural sources, and exhaust from automobiles pre 1996 when leaded gasoline was used. To this day, runoff from leaded gasoline has left high amounts of lead in soil adjacent to roadways since lead does not biodegrade, or disappear over time, but remains in soils for thousands of years.
In modern day, we typically deal with lead remediation by removing and relocating the contaminated soil. Not a great solution, especially considering that so much of our lands are now contaminated and that you need a place to store all the contaminated soil. Some hopeful studies have demonstrated the ability of plants to absorb lead as a form of remediation with a variety of efficacy depending on the plant (see study) and taking decades to complete. While this may be great for decontaminating the soil, it is not great if you are trying to eat the plants being grown in that soil because they are now absorbing the risidual lead as well as arsenic from our modern day gasoline breaking down into the soil.
The active ingredient most widely used on residential lawns in the United States is a chemical mixture called 2,4-dichlorophenoxyacetic acid, or 2,4-D, which is sold in differing formulations under a variety of trade names. Another common herbicide is glyphosate. Studies of occupational exposure to agricultural pesticides (including 2,4-D and glyphosate) have found a positive correlation with certain cancers. To minimize exposure, don't spray your land with these chemicals and don't interact with land that has been sprayed for at least three days after, espicially for children or pets. These chemicals are also leaching into the below ground waterways, polluting drinking water, killing animals and important pollinators, and disrupting natural habitats. Grow or forage your own foods or support organic farms to avoid consuming these chemicals in your food. https://www.flourishandflora.com/post/foraging-around-soil-pollutants