Ozone Data
The American Lung Association State of the Air: 2005 Report demonstrates the poor air quality in Essex County. Essex County received a failing grade (F) for air quality based on ozone. The weighted average for Essex County has actually increased slightly from 9.7 in the previous State of the Air 2004 report that looked at the 2000-2002 three-year average, to 10.3 due to a slight increase in orange days (days deemed unhealthy for sensitive populations).
(1) Orange: Unhealthy For Sensitive Groups (0.085-0.104 ppm ozone), Red: Unhealthy (0.105-0.124 ppm ozone), and Purple: Very Unhealthy (0.125-0.374 ppm ozone).
(2) Wgt. Avg: The weighted average was derived by adding the three years of individual level data (2001-2003), multiplying the sums of each level by the assigned standard weights, i.e. 1=orange, 1.5=red, 2.0=purple, and calculating the average.
(3) * indicates incomplete monitoring data for all three years. Therefore, those counties are excluded from the grade analysis.
(4) A dash (-) indicates that there is no monitor collecting data in the county.
(5) Grades are as follows: A=0.0, B-0.3-0.9, C=1.0-2.0, D=2.1-3.2, F=3.3+.
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