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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: ME00 - Caribou - Airport [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 21, 2022 11:20AM Nov 29, 2022 09:45AM 0.66 1053.50 5.3 5.21 5.06 Normal
Nov 15, 2022 10:10AM Nov 21, 2022 11:20AM 0.98 1135.60 2.0 5.36 5.05 Normal
Nov 8, 2022 09:55AM Nov 15, 2022 10:10AM 2.65 4098.60 2.0 5.14 5.05 Normal
Nov 1, 2022 09:20AM Nov 8, 2022 09:55AM 0.26 362.10 6.4 5.03 5.04 Normal
Oct 25, 2022 09:40AM Nov 1, 2022 09:20AM 0.58 939.30 1.9 5.27 5.05 Normal
Oct 18, 2022 07:25AM Oct 25, 2022 09:40AM 1.78 3182.70 2.1 5.16 5.06 Normal
Oct 11, 2022 10:25AM Oct 18, 2022 07:25AM 1.81 3098.00 2.5 5.32 5.06 Normal
Oct 4, 2022 08:30AM Oct 11, 2022 10:25AM 0.13 182.70 12.4 5.60 5.06 Normal
Sep 29, 2022 10:15AM Oct 4, 2022 08:30AM 0.00 0.00 Insuffient sample available for field measurements.
Sep 20, 2022 10:15AM Sep 29, 2022 10:15AM 1.21 1898.60 3.0 5.61 5.05 Normal
Sep 13, 2022 07:45AM Sep 20, 2022 10:15AM 0.64 1019.20 2.8 5.07 5.06 Normal
Sep 6, 2022 10:45AM Sep 13, 2022 07:45AM 0.00 0.00 Insuffient sample available for field measurements.
Aug 29, 2022 01:15PM Sep 6, 2022 10:45AM 0.38 593.30 4.5 5.49 5.05 Normal
Aug 23, 2022 11:45AM Aug 29, 2022 01:15PM 0.58 914.10 3.1 5.58 5.06 Normal
Aug 16, 2022 09:20AM Aug 23, 2022 11:45AM 1.06 1789.70 2.2 5.43 5.06 Normal
Aug 9, 2022 08:35AM Aug 16, 2022 09:20AM 0.31 516.90 3.7 5.67 5.06 Normal
Aug 2, 2022 12:30PM Aug 9, 2022 08:35AM 1.26 2162.60 4.5 4.72 5.06 Mildly Acidified
Jul 26, 2022 09:00AM Aug 2, 2022 12:30PM 0.18 249.80 Missing Missing Missing Missing
Jul 19, 2022 08:40AM Jul 26, 2022 09:00AM 0.49 745.00 7.1 5.32 5.06 Normal
Jul 12, 2022 09:25AM Jul 19, 2022 08:40AM 1.74 2929.20 1.8 5.39 5.06 Normal
Jul 5, 2022 12:25PM Jul 12, 2022 09:25AM 1.31 2318.50 2.1 5.54 5.06 Normal
Jun 28, 2022 09:25AM Jul 5, 2022 12:25PM 0.41 579.20 7.0 6.60 5.05 Normal
Jun 21, 2022 11:40AM Jun 28, 2022 09:25AM 0.17 269.50 12.2 4.98 5.03 Mildly Acidified
Jun 14, 2022 10:25AM Jun 21, 2022 11:40AM 1.05 1775.60 4.3 5.98 5.10 Normal
Jun 7, 2022 09:00AM Jun 14, 2022 10:25AM 1.94 3248.50 2.9 5.18 5.06 Normal
May 31, 2022 09:25AM Jun 7, 2022 09:00AM 1.01 1760.20 4.1 4.74 5.06 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