What activities cause air pollution? What is the effect of water pollution? What do you do to keep your house clean? What would you do to reduce land pollution?

What activities cause air pollution?
What is the effect of water pollution?
What do you do to keep your house clean?
What would you do to reduce land pollution?
Trl nguyên câu, vào trọng tâm ạ! Em cảm ơn nhiều ạ!♡