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import serial
import datetime
from collections import namedtuple
from os import path

AirQuality = namedtuple('AirQuality', [
    'pm1_standard',   # PM 1.0 concentration in μg/m^3, corrected to standard atmophere conditions
    'pm25_standard',  # PM 2.5 concentration in μg/m^3, corrected to standard atmophere conditions
    'pm10_standard',  # PM 10 concentration in μg/m^3, corrected to standard atmophere conditions
    'pm1_ambient',    # PM 10 concentration in μg/m^3, in the current ambient conditions

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// Bonfire: Truncate a string
// Author: @orelovo
// Challenge: http://www.freecodecamp.com/challenges/bonfire-truncate-a-string
// Learn to Code at Free Code Camp (www.freecodecamp.com)

function truncate(str, num) {
  var newStr = "";
  if (num >= str.length)
    newStr = str;
  else if (num <= 3)