During what time period was lead increasingly recognized as a health hazard?

Lead began to be increasingly recognized as a health hazard during the early 20th century. This period was marked by growing awareness of the toxic effects of lead, particularly as it related to occupational hazards and exposures in various industries. Research during this time began to document the neurological and physical health problems associated with lead exposure, leading to increased scrutiny and regulation.

While the mid-19th century saw some understanding of lead's dangers, it was not until the early 20th century that substantial public health discussions emerged. This period saw significant advancements in medicine and public health knowledge, prompting the scientific community to more thoroughly investigate lead's harmful impacts.

In later decades, particularly during the late 20th century and early 21st century, the recognition of lead as a health hazard expanded further, especially in the context of lead-based paints and the dangers posed to children. However, the foundational work that established lead as a serious health concern began earlier in the 1900s.