If you're asking yourself what type of data your nonprofit should collect, start collecting the data that you will use now. Do a data audit and then figure out how to optimize your data collection so that you get the data you need.
How Nonprofits and Libraries Can Use Open Data to Lead to Cleaner Air
Libraries in Medellín, Colombia, are taking par in a citizen-powered air quality improvement project made possible by Colombian civil society organization MAKAIA. Their project promotes both open data and a cleaner environment around the world.