Picarro makes gas analyzers that the company claims can track concentrations of all sorts of greenhouse gases and pollutants including methane, hydrogen sulfide, CO2, formaldehyde, ammonia and others. Picarro's units can be mounted on a car and driven around a neighborhood or around the perimeter of a refinery or chemical plant, and according to the company, can capture emissions plume information. The YouTube video below shows what one of the units can do. The video shows a real drive in California performed with a standard pickup truck.
Picarro says their emissions detectors are so easy to use that current users include an innkeeper and a high school teacher. According to Picarro, it is literally plug and play. Their customers are among the biggest names in atmospheric sciences including NOAA, the World Meteorological Organization and the Chinese Meteorological Administration. The EPA and other agencies have test-driven their products.
Note: The Environmental Justice Blog, nor any of those listed on this site, are recommending the product and no listees, to our knowledge, are being compensated for this publicity. It does appear to be a very interesting product.