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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: ME98 - Bar Harbor - McFarland Hill Site [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:
Jun 30, 2020 09:00AM Jul 7, 2020 08:59AM 0.24 306.60 8.235 4.78 5.03 Mildly Acidified
Jun 23, 2020 09:00AM Jun 30, 2020 08:59AM 1.39 3234.50 9.455 4.64 5.03 Moderately Acidified
Jun 16, 2020 09:00AM Jun 23, 2020 08:59AM 0.00 1.70 Insuffient sample available for field measurements.
Jun 9, 2020 09:00AM Jun 16, 2020 08:59AM 2.16 3589.40 5.78 4.98 5.02 Mildly Acidified
Jun 2, 2020 09:00AM Jun 9, 2020 08:59AM 0.19 261.10 5.61 5.15 5.02 Normal
May 26, 2020 09:00AM Jun 2, 2020 08:59AM 0.02 13.20 Insuffient sample available for field measurements.
May 12, 2020 09:00AM May 19, 2020 08:59AM 0.96 1677.30 4.67 4.84 5.03 Mildly Acidified
May 5, 2020 09:00AM May 12, 2020 10:26AM 1.15 1797.80 6.12 5.09 4.28 Normal
Apr 28, 2020 09:00AM May 5, 2020 10:25AM 1.49 2011.30 10.08 5.18 4.32 Normal
Apr 21, 2020 09:00AM Apr 28, 2020 08:59AM 1.12 1393.70 19.59 5.06 4.34 Normal
Apr 14, 2020 10:48AM Apr 21, 2020 09:49AM 0.00 0.20 Insuffient sample available for field measurements.
Apr 7, 2020 10:02AM Apr 14, 2020 10:45AM 2.92 3938.00 19.20 5.11 4.37 Normal
Mar 31, 2020 10:38AM Apr 7, 2020 09:59AM 1.69 2570.10 2.45 5.53 4.34 Normal
Mar 24, 2020 11:28AM Mar 31, 2020 10:32AM 0.65 792.10 14.67 4.70 4.40 Mildly Acidified
Mar 17, 2020 09:39AM Mar 24, 2020 11:26AM 1.39 2027.80 4.94 5.20 4.32 Normal
Mar 10, 2020 09:29AM Mar 17, 2020 09:34AM 0.72 1102.70 17.66 4.93 4.34 Mildly Acidified
Mar 3, 2020 10:37AM Mar 10, 2020 09:24AM 0.27 485.30 6.33 4.74 4.32 Mildly Acidified
Feb 25, 2020 09:13AM Mar 3, 2020 10:33AM 1.88 2725.30 18.44 5.19 4.66 Normal
Feb 18, 2020 09:18AM Feb 25, 2020 09:13AM 0.63 912.70 7.06 5.15 4.73 Normal
Jan 28, 2020 09:00AM Feb 4, 2020 08:59AM 0.00 3.00 Insuffient sample available for field measurements.
Jan 21, 2020 08:58AM Jan 28, 2020 09:28AM 9.09 1.50 Insuffient sample available for field measurements.
Jan 14, 2020 09:55AM Jan 21, 2020 08:54AM 1.21 1240.20 8.23 4.91 4.44 Mildly Acidified
Dec 30, 2019 09:00AM Jan 7, 2020 08:59AM 1.17 1530.20 9.86 5.11 4.58 Normal
Dec 24, 2019 09:57AM Dec 30, 2019 12:58PM 0.27 331.00 19.67 4.73 4.64 Mildly Acidified
Dec 17, 2019 09:15AM Dec 24, 2019 09:57AM 0.32 396.30 4.31 5.02 4.69 Normal
Dec 10, 2019 08:53AM Dec 17, 2019 09:13AM 4.24 6928.30 8.35 5.21 4.68 Normal

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