How many bad air days did Los Angeles have?

Grade level: 3rd – 5th grades

Skills: Line graph

Related environmental issues: Air pollution

Area level: Regional

Los Angeles, California, is home to many amusement parks such as the Disneyland and the Universal Studio Hollywood. However, the area has suffered from serious air pollution. Los Angeles has been one of the top 10 cities with the worst air pollution in the United States. The line graph below shows how many bad air days Los Angeles had  in a year between 2005 and 2014.

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  1. In what year, did Los Angeles have the largest number of bad air days?
  2. In what year, did Los Angeles had the smallest number of bad air days?
  3. Between what years, did the number of bad air days decrease consecutively?
  4. Did the year 2014 havemore bad air days than 5 years ago or less?
  5. For how many years did Los Angeles have more than 100 bad air days is a year?

Source: Aircompare, AirNow

Note) The numbers used here are the numbers categorized under “unhealthy air quality days for  older adults and children”.


Answer keys

  1. 2005
  2. 2013
  3. between 2005 and 2007
  4. less
  5. 6years