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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:
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
Jan 21, 2014 12:10PM Jan 28, 2014 11:15AM 0.23 345.10 2.0 4.69 4.55 Moderately Acidified
Jan 14, 2014 11:15AM Jan 21, 2014 12:15PM 0.75 1212.70 1.4 4.89 4.51 Mildly Acidified
Jan 7, 2014 11:25AM Jan 14, 2014 11:08AM 0.70 1245.80 1.3 5.13 4.51 Normal
Dec 31, 2013 11:05AM Jan 7, 2014 11:15AM 1.32 2192.00 1.6 5.41 4.62 Normal
Dec 3, 2013 11:00AM Dec 10, 2013 11:10AM 0.45 687.50 1.6 5.30 4.35 Normal
Nov 26, 2013 11:14AM Dec 3, 2013 10:50AM 2.34 4130.70 2.3 5.41 4.61 Normal
Nov 19, 2013 10:18AM Nov 26, 2013 11:10AM 0.06 99.90 Missing Missing Missing Missing
Nov 12, 2013 10:55AM Nov 19, 2013 10:15AM 0.77 1248.20 Missing Missing Missing Missing
Nov 5, 2013 11:19AM Nov 12, 2013 10:53AM 0.46 742.10 3.5 4.82 4.45 Mildly Acidified
Oct 29, 2013 11:45AM Nov 5, 2013 11:13AM 0.67 1113.20 1.9 4.91 4.57 Mildly Acidified
Oct 22, 2013 11:05AM Oct 29, 2013 11:40AM 0.22 327.70 Missing Missing Missing Missing
Oct 15, 2013 11:37AM Oct 22, 2013 11:02AM 0.44 745.60 2.0 4.64 4.96 Moderately Acidified
Oct 8, 2013 10:40AM Oct 17, 2013 08:23AM 0.03 58.40 Insuffient sample available for field measurements.
Oct 1, 2013 11:40AM Oct 8, 2013 10:40AM 0.98 1608.70 1.9 4.58 5.09 Moderately Acidified
Sep 24, 2013 11:25AM Oct 1, 2013 10:27AM 0.02 6.80 Insuffient sample available for field measurements.
Sep 17, 2013 11:25AM Sep 24, 2013 10:27AM 0.72 1241.60 5.6 4.64 5.27 Moderately Acidified
Sep 10, 2013 10:41AM Sep 17, 2013 11:21AM 1.70 2885.50 1.7 4.68 5.34 Moderately Acidified
Sep 3, 2013 12:05PM Sep 10, 2013 10:39AM 0.35 654.40 1.7 4.66 5.03 Moderately 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