https://phys.org/news/2019-01-historical-emissions-trends.html

Country-to-country differences in compiling emissions data make it difficult to construct consistent time series of past emissions across regions. Researchers overcame these difficulties to build a data set that contains annual estimates of carbon monoxide, methane, ammonia, oxides of nitrogen, sulfur dioxide, and non-methane volatile organic compounds, carbonaceous aerosols, and carbon dioxide for the years 1750–2014 by country, fuel, and sector, along with seasonal data. Researchers developed these data with the Community Emissions Data System (CEDS). This system integrates population, energy consumption, and other economic driver data with national and global emissions inventory data to produce consistent emissions trends over time. In developing this data set, they used open-source software and data, a consistent methodology for all emissions species, and national inventory data sets. The CEDS software and data will be publicly available through an open-source repository to facilitate community involvement and improvement.

                                                            
                                    
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                                    Rachel M. Hoesly et al. Historical (1750–2014) anthropogenic emissions of reactive gases and aerosols from the Community Emissions Data System (CEDS), Geoscientific Model Development (2018). DOI: 10.5194/gmd-11-369-2018