LGHAP.v1: 21-Year Gap-Free Air Pollution Grids for China at 1-km Resolution

21-year-long (2000–2020) gap-free annual mean Aerosol Optical Depth (AOD), PM2.5, and PM10 concentration data with a 1-km resolution covering the land area of China. The LGHAP.v1 dataset was generated by Kaixu Bai of East China Normal University from daily gap-free AOD data using a machine learning regression model that integrated data from multiple sensors and platforms. Data is provided in NetCDF format with Python, Matlab, R, and IDL codes for reading and visualization.

Use Cases

• Analyzing long-term trends in particulate matter (PM2.5, PM10) concentrations across China based on the 21-year time series.
• Modeling population exposure to air pollution based on the high-resolution 1-km gridded data covering all of China's land area.
• Validating regional air quality models and satellite retrievals based on the gap-free, machine learning-integrated AOD data.
• Assessing the effectiveness of environmental policies on air quality over two decades based on the annual mean concentration grids.

Strengths

• 21 years of continuous annual data (2000–2020), providing a long-term perspective on air pollution.
• High spatial resolution of 1 kilometer for detailed geographic analysis across China's land area.
• Gap-free data generation via a machine learning model that integrates multiple data sources and sensors.
• Includes three key air pollutant metrics: Aerosol Optical Depth (AOD), PM2.5, and PM10 concentrations.

Limitations

• Data is provided as annual means, which may not capture seasonal or daily pollution variability.
• The description does not specify the accuracy metrics or validation results for the machine learning model outputs.
• Documentation on specific data processing steps and potential biases from source integration is limited in the provided description.

Provenance

Source

East China Normal University

Collection Method

Generated from daily gap-free AOD data using a machine learning regression model integrating multiple sensor/platform datasets.

Time Range

2000–2020

Geography

Land area of China