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Department of Environmental Protection - Bureau of Air Quality
Air Quality - Online Data Service
Home : Atmospheric Deposition (Acid Rain) : Monitoring Location Selection

Below is the data summary for the following location:

Location: ME09 - Greenville - Squaw Brook (UM) [select a new location]

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Supplemental Information: term definitions | general description of pH readings

Sample Start Date: Sample Stop Date: Total Precipitation - Rain Gauge: (inches) Total Precipitation - Sample Weight: (grams) Field Conductance Reading: (us/cm) Field pH Reading: Field pH Check Sample Reading: Precipitation Acidity Level:
Nov 10, 2009 09:40AM Nov 17, 2009 10:20AM 2.09 4443.10 5.1 4.91 4.98 Mildly Acidified
Nov 3, 2009 09:53AM Nov 13, 2009 09:40AM 0.47 1492.50 5.2 4.97 4.94 Mildly Acidified
Oct 27, 2009 09:45AM Nov 3, 2009 09:53AM 0.31 1413.50 4.9 4.51 4.86 Moderately Acidified
Oct 20, 2009 10:48AM Oct 27, 2009 09:42AM 2.34 4779.50 5.0 4.82 4.88 Mildly Acidified
Oct 13, 2009 10:41AM Oct 20, 2009 10:44AM 0.27 370.00 Missing Missing Missing Missing
Oct 6, 2009 11:45AM Oct 13, 2009 10:38AM 1.37 2120.40 5.6 4.86 4.82 Mildly Acidified
Sep 29, 2009 10:30AM Oct 6, 2009 11:45AM 1.84 1888.30 Missing Missing Missing Missing
Sep 22, 2009 10:00AM Sep 29, 2009 10:20AM 1.37 1561.00 Missing Missing Missing Missing
Sep 15, 2009 11:30AM Sep 22, 2009 09:55AM 0.04 76.90 Missing Missing Missing Missing
Sep 8, 2009 09:35AM Sep 15, 2009 11:27AM 0.00 0.00 Insuffient sample available for field measurements.
Sep 1, 2009 10:00AM Sep 8, 2009 09:28AM 0.00 0.00 Insuffient sample available for field measurements.
Aug 26, 2009 11:59AM Sep 1, 2009 09:55AM 0.56 837.10 4.4 5.02 4.91 Normal
Aug 18, 2009 12:00PM Aug 26, 2009 12:05PM 0.71 1166.90 11.3 4.95 4.47 Mildly Acidified
Aug 11, 2009 09:50AM Aug 18, 2009 11:57AM 0.00 851.10 7.5 4.86 4.92 Mildly Acidified
Aug 4, 2009 01:35PM Aug 11, 2009 09:50AM 0.00 477.50 4.2 5.05 4.96 Normal
Jul 28, 2009 10:26AM Aug 4, 2009 01:35PM 2.41 4042.00 3.2 5.08 4.88 Normal
Jul 21, 2009 10:41AM Jul 28, 2009 10:26AM 2.21 3524.00 5.7 5.02 4.86 Normal
Jul 14, 2009 10:20AM Jul 21, 2009 10:41AM 0.52 873.50 17.4 4.48 4.89 Moderately Acidified
Jul 7, 2009 10:07AM Jul 14, 2009 10:20AM 0.61 859.50 8.2 4.93 4.87 Mildly Acidified
Jun 30, 2009 09:57AM Jul 7, 2009 10:07AM 2.01 3339.80 4.0 5.04 4.87 Normal
Jun 23, 2009 09:58AM Jun 30, 2009 09:57AM 1.82 2899.10 8.2 4.77 4.88 Mildly Acidified
Jun 16, 2009 09:27AM Jun 23, 2009 09:58AM 1.22 1671.50 2.8 5.25 5.02 Normal
Jun 9, 2009 10:27AM Jun 16, 2009 09:27AM 1.83 2966.40 3.1 5.11 4.96 Normal
Jun 2, 2009 01:16PM Jun 9, 2009 10:27AM 0.01 29.00 Insuffient sample available for field measurements.
May 26, 2009 10:38AM Jun 2, 2009 01:16PM 1.44 2267.80 4.8 5.09 4.98 Normal
May 20, 2009 10:06AM May 26, 2009 10:38AM 0.00 1.10 Insuffient sample available for field measurements.

Term Definitions

Term: Definition
Sample Start Date Start date of the sample collection period.
Sample Stop Date Stop date of the sample collection period.
Total Precipitation - Rain Gauge (inches) Total amount of precipitation measured during the sample collection period in inches.
Total Precipitation - Sample Weight (grams) Weight of the precipitation collected during the sample collection period.
Field Conductance Reading (us/cm) Conductance is a measure of the ability of water to conduct an electrical current.  It provides an indication of the amount of dissolved material in the sample.  Units are microsiemens per centimeter.
Field pH Reading pH measures the scale of acidity of the water based on the hydrogen ion's activity.  The range goes from 0-14, with 7 being neutral.  pH of less than 7 indicates acidity, whereas a pH of greater than 7 indicates a base.  The natural background of rainwater in New England has a pH of approximately 5.0.
Field pH Check Sample Reading Quality Control Check Sample is used to verify the calibration of the pH Meter.  The check sample should read 4.90 +/- 0.20 pH units.
Precipitation Acidity Level General description of the acidity level based on the field pH reading.

General description of pH readings

pH Range Precipitation Acidity Category
7.00 - 9.99 Slightly alkaline
5.00 - 6.99 Normal
4.70 - 4.99 Mildly Acidified
4.40 - 4.69 Moderately Acidified
4.10 - 4.39 Strongly Acidified
1.00 - 4.09 Severely Acidified

 

Questions about this Service? Contact the Bureau at: (207) 287-2437 or Email: depair@maine.gov