Some ways you could do to minimize pollution in your house are:
1. Keep the things clean and tidy
2. Save the use of gas
3. Take care some green trees (reasonable quantity)
4. Through away the unused things (Do not make your house become a junk shop)
5. Do not operate the motorbike inside the house
6. Do not keep the garbage over night
7. Do not raise many animals. In case you have a pet you should take him/her to visit the VET doctor by periodic appointment.
Cheers!
P/s: The most importance is the atmosphere: Do not argue loudly with your family members