Which air quality is better in the south or north of Xi'an?

**The air quality in the north of Xi'an City is relatively good**. According to measured data, the PM2.5 in the north of the city is the lowest, while the PM2.5 in the south of the city is the highest, indicating that the air quality in the north of the city is relatively good.

However, please note that this is only an actual measurement data. Air quality will be affected by many factors, such as traffic conditions, industrial emissions, domestic pollution, etc., so the air quality in the south and north of the city may change over time. And something has changed. At the same time, there may also be limitations in the data, and there may be changes in air quality at other times or in other areas.

To sum up, according to actual measurement data, the air quality in the north of the city is better than that in the south. However, it should be noted that this is not an absolute situation. Air quality will change with various factors such as time and location.