The study looked at how air pollution in Changchun is affected by different factors. They measured the amount of particulate matter in the air at different times and locations in the city. They found that pollution levels were highest in the first and fourth quarters of the year. Pollution peaks usually happened in the morning and evening. Pollution was most concentrated in the central, northern, and western parts of the city. The amount of particulate matter was linked to factors like humidity, temperature, and wind speed. The study also showed that air coming from the northwest had the biggest impact on pollution levels in Changchun, except in the summer.