Current Air Quality Data - Downeast Region
Below are the hourly air quality concentrations for theDowneast Region of Maine for Dec 5, 2013.
Data is reported based on the Air Quality Index.
Special status notes:
IMPORTANT WINTER NOTES: 1) Particle pollution (fine particle) levels often rise during the overnight hours. This occurs mostly on calm, clear, cold nights when inversions form and behave like a cap keeping pollution from lifting high above the surface. You can see the inversion layer because smoke from heating devices will hover like a blanket. Higher terrain will trap pollution in valleys and bowls. If the air does not mix well during the day, or many heating devices are concentrated in a valley area, the 24 hour average of particle pollution can reach the Moderate range for the day. 2) Coarse particles levels will rise near roadways and parking lots as the sand & salt is stirred up by winds or vehicle traffic. This is most likely in the days following a winter storm. Once the sand/salt mixture dries out it is stirred up more easily.
Region Summary - Dec 5, 2013
This chart displays the region's final AQI for each day of the last 7 regardless of which pollutant produced that value.
Hourly Air Concentrations - Dec 5, 2013
[Text explaining what these graphs are]. Ozone charts chart display a running 8-hour average AQI for each hour up to the last hour posted. Particle Pollution charts use a 24-hour running average.
The hourly pollutant values, shown in the graphs, are based on the national Air Quality Index (AQI). The AQI is computed from data collected by a network of air monitoring sites. The AQI converts the pollutant concentrations to a value easily compared to the health standard of each pollutant.
8-hour Ozone and 24-hour Particle Pollution concentrations with an AQI over 100 have exceeded the health standard.
The Regional Summary graph is a visual display of the final AQI value for each day of the last seven days. The final AQI value for a given day is the highest AQI reached by any monitor in that region regardless of which pollutant was involved.
Site-specific graphs display the AQI associated with the current running average. When viewed late in the day one can see how the pollution levels changed over the course of that day.
The color-coding is based on the AQI. Green indicates values in the "good" range; yellow in the "moderate" range; orange in the "unhealthy for sensitive groups" range; red in the "unhealthy" range, and purple in the "very unhealthy" range. An X indicates suspect data.