22 - Asbestos levels at Ground Zero were 22 times higher than the levels in Libby, Montana, where the W R Grace mine produced one of the worst Superfund disasters in US history.

"Results": [
    {
        "TypeName": "LOC",
        "Text": "Ground Zero",
        "Start": 24,
        "End": 35
    },
    {
        "TypeName": "LOC",
        "Text": "Libby",
        "Start": 76,
        "End": 81
    },
    {
        "TypeName": "LOC",
        "Text": "Montana",
        "Start": 83,
        "End": 90
    },
    {
        "TypeName": "LOC",
        "Text": "W R Grace mine",
        "Start": 102,
        "End": 116
    },
    {
        "TypeName": "LOC",
        "Text": "US",
        "Start": 166,
        "End": 168
    }
]