What gases might cause brain tumours?

There is no definitive evidence that specific gases directly cause brain tumors, but exposure to certain environmental toxins and chemicals, such as formaldehyde or vinyl chloride, has been studied for potential links to brain cancer. Additionally, prolonged exposure to high levels of ionizing radiation is a known risk factor for various types of tumors, including brain tumors. Other factors, such as genetics and lifestyle, also play significant roles in the development of brain tumors. More research is necessary to fully understand the relationship between gas exposure and brain tumor incidence.