You need to get up to speed. There is no mercury at all in photovoltaic cells. You’re thinking of mirror arrays, which are no longer in production. There is cadmium, but this is in semiconductors, not used in any part that would be affected by hail.
No mercury true but many other toxins note American Experiment Org. recycling is a problem and causes risks to land and animals.
Early panels had it until forced from using it.