Participate in the citizen scientist Globe At Night initiative, sponsored by the National Science Foundation, as a visual observer.
 
Following five easy steps, using only your eyes, you can make sky measurements that will contribute to a world wide light pollution database used by scientist to map and track global light pollution. The how to is detailed on the Globe At Night website.
 
In a nutshell, the site provides a series of charts, for each of several selected constellations, corresponding to different levels of light pollution. The darker the sky the more stars you can see in the constellation best position for observing on a given night. By matching the chart to what can be seen an estimate of the light pollution at that place and time can be made and be reported. The side benefit is that over time an observer will learn the night sky’s principal constellations.