**GHOST** (Globally Harmonised Observational Surface Treatment) is a project dedicated 
to the harmonisation of global surface observations (most notably air quality pollutants) 
for the purpose of faciliting greater scientific evaluation by the scientifc community.

The documentation directory contains detailed descriptions regarrding the processing 
procedures undertaken.

A summary of the network (and data ranges) currently contained under the umbrella 
of **GHOST** are given here:

**Network**   **Data range**
**EBAS**        1970-2018