Hi Rebecca. So sorry for your loss. Our condolences. You can read about research into environmental factors that may cause ALS here: https://www.als.org/research/research-we-fund/scientific-focus-areas/en… In addition, the National ALS Registry is collecting critical information to help us learn what causes the disease, how it can be treated and even prevented. Learn more here: https://www.als.org/research/als-registry