Light extinction is a direct measurement of the level of haziness at the park.
The greater the extinction the greater the haziness. Particle scattering is being measured at one location in the park using several nephelometers. Independent absorption measurements are being made using several aethelometers and a new acoustic method by researchers at Colorado State University and Desert Research Institute, respectively. These instruments sample on a continuous basis with the data being archived as 5-minute averages. Data from one of the transmissometers are used to estimate the visual range displayed with the image appearing here .