Hourly Atmospheric Ammonia Measurements from 10 Sites in Quzhou County, 2021-2025

Four years of hourly ammonia (NH₃) concentration data from 10 monitoring sites across Quzhou County on the North China Plain. Wen Xu created this dataset, which uses XGBoost for imputation to address missing values from instrumental interruptions. The reconstructed data reveals a peak annual mean of 36.9 ppb in 2022-2023 and a persistent north-south concentration gradient.

Use Cases

• Evaluating emission reduction policies based on the four-year trend of NH₃ concentrations.
• Validating satellite-derived NH₃ products using high-resolution ground-based observations.
• Informing air quality models with spatially heterogeneous data showing a north-south gradient.
• Analyzing meteorological controls on NH₃ using SHAP-identified factors like water vapor pressure and wind speed.
• Studying diurnal and seasonal patterns of NH₃, including its bimodal seasonal cycle.

Strengths

• High temporal resolution with hourly measurements over four years (2021-2025).
• Addresses data gaps using XGBoost machine learning imputation, noted for handling extreme concentration events.
• Captures spatial heterogeneity with data from 10 sites, showing a range from 20.9 ppb to 52.5 ppb.
• Provides specific annual mean concentration values (e.g., 28.9 ppb in 2021-2022, 36.9 ppb peak in 2022-2023).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Geographic coverage is limited to a single county (Quzhou County) on the North China Plain.
• Row count is unknown, which may limit suitability assessment for large-scale modeling.

Provenance

Source

figshare

Collection Method

Observational data from 10 monitoring sites, with missing values imputed using an XGBoost model.

Time Range

2021-2025

Freshness

Last updated 2026-05-12 09:59:30; freshness should be verified.

Geography

Quzhou County, North China Plain