What is formaldehyde known for in relation to its health impacts?

Formaldehyde is primarily recognized for its potential health impacts, particularly related to cancer. The correct choice highlights that formaldehyde is known to cause cancer in animals, which has been well-documented in various studies. However, the evidence regarding its carcinogenic effects in humans remains inconclusive. This distinction is crucial, as it underlines the need for further research to ascertain the extent of human health risks related to formaldehyde exposure.

The idea that formaldehyde is definitely linked to cancer in humans, while popularized in many discussions about environmental health, has not been fully substantiated in scientific literature, making the assertion that it causes cancer in humans too definitive given the existing evidence.

It's also critical to note that formaldehyde is not linked to improving air quality in homes; rather, it is known for its presence in various household products and building materials, often contributing to indoor air pollution and health concerns. Thus, while it poses risks of certain health issues, specifically regarding carcinogenicity in animal studies, the evidence of its effects in humans requires careful examination.