Why is it necessary to sweep the house on the 24th day of the Lunar New Year?

The twenty-fourth day of the lunar month is the "dust day". Sweeping dust is the end of the year cleaning, the north said "sweeping room", the south called "dusting". Sweeping dust before the Spring Festival is a traditional habit of our people. Whenever the Spring Festival is approaching, families have to clean up the environment, inside and outside the courtyard for a thorough cleanup.

Because the "dust" and "Chen" consonant, the Spring Festival dust sweeping "in addition to the meaning of Chen Bu Xin", is to be all "poor luck! ", "bad luck" are swept out. Some places, from the twenty-third day of the lunar month to New Year's Eve, this period of time is called "dust day", also known as "spring day". This custom also reflects the Chinese people's love of cleanliness, hygiene, traditional habits, and symbolizes the good expectations of people, passed down to the present day.

Expanded:

Every year, from the Lunar New Year's Day (23rd day of the Lunar month) to New Year's Eve, Chinese people call this period of time "Spring Festival Day", also known as "Dust Sweeping Day". Sweeping dust is the end of the year cleaning, the north said "sweeping room", the south called "dust" dust sweeping.

Sweeping the dust before the Spring Festival is a traditional habit of the Chinese people. Whenever the Spring Festival comes, every household has to clean up the environment, wash all kinds of utensils, dismantle and wash the bedding and curtains, sprinkle and sweep the courtyard, dust and brush the dust and cobwebs, and dredge the nullahs and ditches. The north and south of the Yangtze River, everywhere overflowing with joy to engage in health, clean and welcome the new year's atmosphere.

Baidu Encyclopedia - The 24th day of the Lunar New Year