Look for complete geospatial metadata in this layer's associated xml document available from the download link Particle pollution represents a main component of wildfire smoke and the principal public health threat. Fine particles (also known as PM2.5) are particles generally 2.5 µm in diameter or smaller and represent a main pollutant emitted from wildfire smoke. Fine particles from wildfire smoke are of greatest health concern. The particulate matter element is described and represented by two metrics: potential total smoke production index and potential avoided smoke production index (indicated by asterisks). The condition score for the Particulate Matter element is calculated as the average of the condition scores for the two metrics. * Metric Name: Element Representation: Particulate Matter * Unit Of Measure: Condition score, +1 to -1 * Translation: Where is particulate matter least likely to impact air quality in the event of a fire?