function processAQI(arr) {
    for (var i = 0; i < arr.length; i++) {
        var line = arr[i];
        var aqi = line[1];
        if (aqi <= 50) {
            line[7] = '"?"';
        }
        else if (aqi <= 100) {
            line[7] = '"?"';
        }
        else if (aqi <= 150) {
            line[7] = '"????"';
        }
        else if (aqi <= 200) {
            line[7] = '"????"';
        }
        else if (aqi <= 300) {
            line[7] = '"????"';
        }
        else {
            line[7] = '"????"';
        }
    }
    console.log(arr.join('],\n    ['));
} 
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