How are we protected from dangerous air pollution?

Grade level: 4th – 6th grades

Skills: Place value (whole numbers)

Related environmental issues: Air

Clean air is essential for our health.The United States has protected Americans from dangerous air pollution that cause asthma, lung diseases, and early death by enacting the law called the Clean Air Act. It is estimated that the Clean Air Act will save at least 230,000lives by 2020 in this country.


  1. What digit is in the tens place of 230,000?
  2. What place is the 3 in 230,000?
  3. How many thousands are in this number?
  4. How many hundreds are represented by the 2?
  5. How many ones are represented by the 3?
  6. Which number represents 230,000?
a.23  x 102
b.23 x 103
c.23 x 104
d.23 x 105


Source: U.S. EPA, Clean Air Act Overview.

Photo: WWF


Answer keys

2.Ten thousands




The 225 Math Quizzes That Will Make You An Environmental Expert (2019) is available from  (paperback)

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How do you get sick because of air in your house?

Grade level:  3rd- 5th grades

Skills: Addison and subtraction

Related environmental issues: Air 

Luckily, we don’t have anybody who die because of the air in your house (household air pollution) in the United States. However, many people around the world get sick and even die because of household air pollution. One out of 6 people in the world doesn’t have electrity and burns wood or coal in their house for cooking and heating instead. Breading harmful smoke from burning materials inside the house damages their health.

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1. In the Philippines, Asia, 47,676 men and 39,003 female unfortunately died because of household air pollution in 2016 alone. How many deaths did the Philippines have due to household air pollution?

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2. In the same year, 37,461 deaths occurred because of car crashes in the United States. How many more or less people died from household air pollution in the Philippines?


World Health Organization, Global Health Observatory data respiratory, Death by country

Insurance Institute for Highway Safety, State by State general statistics for 2016

Photo- Science Daily, 2012. Open-fire cooking may affect child cognitive development



Answer keys

  1. 47,676 + 39,003 = 86,679
  2. 86,679 – 37,461 = 49,218 more people