The presentation of data here seems misleading. The red-green glow around each point seems like it's showing some sort of range of toxicity or something, that

The presentation of data here seems misleading. The red-green glow around each point seems like it's showing some sort of range of toxicity or something, that anything in the glow is affected somehow. But it's actually just a highlight around the icon. If you zoom in, the glow stays the same relative to the icon, but the range on the map is greatly reduced. If you zoom all the way out, it looks like the whole place in in a red zone, but it's not that way if you zoom in.