To construct a land use regression (LUR) model for particulate matter with an aerodynamic diameter ≤2.5 μm (PM2.5) in Zunyi.
Collect and organize hourly PM2.5 monitoring data from routine air quality monitoring stations from January 1, 2020 to December 31, 2020, as well as geographic information data such as land use, roads, population density, altitude, and meteorological factors in Zunyi. Conduct multiple stepwise linear regression with PM2.5 concentration as the dependent variable and geographic information variables and meteorological factors as independent variables to construct a model. Use leave-one-out cross validation (LOOCV) to verify the performance of the model.
The model formula is Y=72.656-0.026×altitude-0.009×NDVI-0.62×average temperature-383.512×average precipitation. The model had R2=0.74, adjusted R2=0.72, cross validation R2=0.69, RMSE=3.51, and a high spatial resolution (250 m×250 m).
The model fits well and fully reflects the influencing factors of PM2.5 spatial distribution in Zunyi. It can be used to estimate individual exposure levels and provide strong support for environmental health epidemiological research.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |