{
    "region_metadata": [ {..many dictionaries here..

    ],
    "items": [
        {
            "timestamp": "2017-09-24T14:00:00+08:00",
            "update_timestamp": "2017-09-24T14:06:18+08:00",
            "readings": {
                "pm25_one_hourly": {
                    "west": 19,
                    "east": 18,
                    "central": 17,
                    "south": 13,
                    "north": 23
                }
            }
        }
    ],
    "api_info": {
        "status": "healthy"
    }
}

resp = requests.get(url, headers=h)

binary = resp.content
output = json.loads(binary)

for key, value in output.items():
    if key == "items":
        print (value)