This document summarizes trends in global anthropogenic emissions and visibility from 1850-1990 based on various data sources. It discusses seasonal peaks and trends for different world regions using satellite data on aerosol optical thickness, fire locations, and extinction coefficient contours. While satellite data provides spatial and seasonal patterns, it has limitations over cloudy areas and lacks speciation and vertical distribution information. Surface visibility and continental concentration data provide longer term records but are limited to lower altitudes and do not include chemical composition details. Overall, the data sources allow analyzing broad emission patterns and trends but have incomplete information for full understanding of historical air quality changes.