Counterintuitively, air pollution is often much worse inside the home than it is outdoors. A tremendous number of different types of pollutants can enter the home through common products and remain trapped there. Take this quiz to see if you've learned enough about indoor air quality to allow yourself to breathe easily.
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!