Abstract: With the acceleration of urbanization process, cities gradually expand and a series of eco-environmental problems have arisen. Park green space, as an important expansion path for urban greening, can effectively mitigate and improve air quality of city and its surroundings. We analyzed the variation of particulate matter and negative air ion concentrations in different functional areas of Dongling Park in Shenyang and explored the relationship between them. The results showed that, in different functional areas of Dongling Park, the lowest value of particulate matter concentration (TSP, PM₁₀, PM_2.5 and PM_1.0) during the day occurred in the mountain forest ecological area between 13:00-16:00, and the highest value occurred in the cultural landscape area between 07:00-10:00. For monthly variation, the lowest value appeared in the lakeside recreation area in September, and the highest value appeared in the cultural landscape area in July. The concentration of particulate matter in different functional areas was significantly different, with significantly higher values in the cultural landscape area than that of other functional areas. There was no significant difference in negative air ion concentration in different functional areas. The lowest value of diurnal variation of negative air ion concentration appeared in the cultural landscape area between 07:00-10:00, and the highest value appeared in the mountain forest ecological area between 13:00-16:00. The lowest value of monthly variation appeared in the cultural landscape area in July, and the highest value appeared in the lakeside recreation area in September. The particulate matter concentration in different functional areas showed a significantly negative correlation with negative air ion concentration (P<0.05). The correlation between TSP, PM₁₀ and negative air ion was higher. The particulate matter concentration in the mountain forest ecological area had strong correlation with negative air ion concentrations (TSP, PM₁₀, PM_2.5 and PM_1.0), with correlation coefficients of -0.698, -0.647, -0.525 and -0.485, respectively.

Key words: park green space, particulate matter, functional area, correlation, negative air ion.