Current Air Quality Data - Northern Region

Below are the hourly air quality concentrations for theNorthern Region of Maine for Apr 18, 2014.

Data is reported based on the Air Quality Index.

Special status notes:

IMPORTANT EARLY SPRING NOTE: 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 - Apr 18, 2014

This chart displays the region's final AQI for each day of the last 7 regardless of which pollutant produced that value.

Bar chart showing high values for each of the last seven days, for the Northern region.

Hourly Air Concentrations - Apr 18, 2014

[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.

Interpreting the data

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.