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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:
Aug 5, 2014 11:55AM Aug 12, 2014 10:12AM 0.30 562.50 1.3 5.76 4.34 Normal
Jul 29, 2014 10:56AM Aug 5, 2014 11:52AM 0.85 1500.90 1.5 4.66 4.36 Moderately Acidified
Jul 22, 2014 10:40AM Jul 29, 2014 10:51AM 2.01 3433.20 1.6 4.92 4.38 Mildly Acidified
Jul 15, 2014 12:18PM Jul 22, 2014 10:32AM 0.83 1456.50 1.6 5.05 4.41 Normal
Jul 8, 2014 11:14AM Jul 15, 2014 12:15PM 0.48 439.10 2.0 4.64 4.29 Moderately Acidified
Jun 24, 2014 10:45AM Jul 1, 2014 12:09PM 1.77 3053.30 1.4 5.15 4.47 Normal
Jun 17, 2014 11:05AM Jun 24, 2014 10:40AM 0.99 1716.40 1.4 5.20 4.45 Normal
Jun 10, 2014 09:05AM Jun 17, 2014 10:55AM 2.12 3650.70 1.4 5.19 4.47 Normal
May 27, 2014 11:15AM Jun 3, 2014 11:10AM 0.74 1268.00 1.5 5.50 4.46 Normal
May 20, 2014 10:50AM May 27, 2014 11:08AM 0.39 685.90 1.4 5.58 4.52 Normal
May 13, 2014 11:10AM May 20, 2014 10:45AM 1.60 2771.30 1.4 5.03 4.17 Normal
May 6, 2014 10:45AM May 13, 2014 11:05AM 0.23 408.80 1.4 5.46 4.56 Normal
Apr 29, 2014 10:45AM May 6, 2014 10:30AM 1.45 2484.10 1.1 4.79 4.22 Mildly Acidified
Apr 22, 2014 12:20PM Apr 29, 2014 10:40AM 0.63 1058.80 1.4 4.95 4.53 Mildly Acidified
Apr 15, 2014 11:06AM Apr 22, 2014 12:00PM 1.35 2207.50 1.5 5.55 4.56 Normal
Apr 8, 2014 11:10AM Apr 15, 2014 11:10AM 0.21 289.00 1.4 5.01 4.49 Normal
Apr 1, 2014 11:20AM Apr 8, 2014 11:05AM 0.90 1524.90 1.5 5.18 4.52 Normal
Mar 25, 2014 11:25AM Apr 1, 2014 11:10AM 1.38 2195.00 1.5 5.60 4.54 Normal
Mar 18, 2014 11:45AM Mar 25, 2014 11:20AM 1.32 2219.60 1.6 5.49 4.39 Normal
Mar 11, 2014 11:30AM Mar 18, 2014 11:40AM 2.09 3579.00 1.4 5.24 4.58 Normal
Mar 4, 2014 11:40AM Mar 11, 2014 11:22AM 0.23 387.90 1.7 4.70 4.55 Mildly Acidified
Feb 25, 2014 11:20AM Mar 4, 2014 11:35AM 0.05 80.70 Missing Missing Missing Missing
Feb 18, 2014 11:05AM Feb 25, 2014 11:15AM 0.69 1064.70 1.6 4.6 5.16 Moderately Acidified
Feb 11, 2014 11:30AM Feb 18, 2014 11:00AM 2.32 3743.20 1.3 5.41 4.53 Normal
Feb 4, 2014 10:40AM Feb 11, 2014 11:25AM 0.41 670.30 1.4 5.03 4.63 Normal
Jan 28, 2014 11:30AM Feb 4, 2014 10:35AM 0.31 520.70 1.4 4.71 4.63 Mildly Acidified

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