About PHD >

PHD (PM_2.5 Hindcast Database) is a database that provides historical PM_2.5 estimates across China, during 2000-2016. Using a machine learning approach, PHD assembled datasets from multiple sources, including MODIS satellite measurements of aerosol, CMAQ modeling outputs based on MEIC historical emission inventories and many other spatiotemporal variables, and hindcasted the daily PM_2.5 concentrations from 2000 to 2016 in China.

PHD provides annual concentrations of PM_2.5 and counts of polluted days in a regular grid of 0.1° × 0.1°, across the mainland of China, from 2000 to 2010, and other results derived from the product.

Usage criteria >

PHD should not be utilized for commercial purposes.

For any published articles / materials or unpublished reports / products that related to PHD, please cite the following paper.

Xue, T., Zheng, Y., Tong, D., Zheng, B., Li, X., Zhu, T., & Zhang, Q. (2019). Spatiotemporal continuous estimates of PM_2.5 concentrations in China, 2000–2016: A machine learning method with inputs from satellites, chemical transport model, and ground observations. Environment International, 123, 345-357

Download >

1. PHD PM_2.5 annual concentrations (μg/m³)：
PHD_annual_concentraion.csv

2. PHD Polluted-and-above days (PM_2.5 > 75 μg/m³, day)：
PHD_polluted_days.csv

3. PHD Heavily-polluted-and-above days (PM_2.5 > 150 μg/m³, day)：
PHD_heavily-polluted_days.csv

4.Population-weighted mean concentration of PHD in PM_2.5 months(μg/m³)
PHD_monthly population weighted concentrations.csv