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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:
Jun 30, 2020 09:40AM Jul 7, 2020 10:10AM 0.22 349.50 10.8 4.67 5.03 Moderately Acidified
Jun 23, 2020 12:05PM Jun 30, 2020 09:40AM 0.40 599.10 5.0 5.17 5.03 Normal
Jun 16, 2020 10:40AM Jun 23, 2020 12:05PM 0.00 2.40 Insuffient sample available for field measurements.
Jun 9, 2020 02:45PM Jun 16, 2020 10:40AM 0.24 411.20 8.7 5.32 5.03 Normal
Jun 2, 2020 10:15AM Jun 9, 2020 02:45PM 0.36 556.80 6.9 5.25 5.05 Normal
May 26, 2020 09:35AM Jun 2, 2020 10:15AM 0.55 937.10 4.3 5.6 5.03 Normal
May 19, 2020 10:35AM May 26, 2020 09:35AM 0.01 1.00 Insuffient sample available for field measurements.
May 12, 2020 10:25AM May 19, 2020 10:35AM 0.48 655.20 5.1 5.17 5.03 Normal
May 5, 2020 08:40AM May 12, 2020 10:25AM 0.73 602.70 9.5 5.50 4.89 Normal
Apr 28, 2020 09:10AM May 5, 2020 08:40AM 0.71 1072.60 4.8 5.52 4.93 Normal
Apr 21, 2020 10:50AM Apr 28, 2020 09:10AM 0.58 796.90 3.8 5.64 4.99 Normal
Apr 14, 2020 08:55AM Apr 21, 2020 10:50AM 0.12 174.90 15.1 6.64 5.03 Normal
Apr 7, 2020 09:05AM Apr 14, 2020 08:55AM 1.75 1978.00 3.4 5.77 5.03 Normal
Mar 31, 2020 09:15AM Apr 7, 2020 09:05AM 0.64 886.10 3.2 5.32 5.01 Normal
Mar 24, 2020 08:25AM Mar 31, 2020 09:15AM 0.55 555.80 3.8 5.42 4.98 Normal
Mar 17, 2020 09:00AM Mar 24, 2020 08:25AM 0.36 366.20 3.6 5.43 5.04 Normal
Mar 10, 2020 08:45AM Mar 17, 2020 09:50AM 0.87 1075.60 4.0 5.42 4.98 Normal
Mar 3, 2020 10:10AM Mar 10, 2020 08:45AM 1.26 1661.20 6.6 5.36 4.99 Normal
Feb 25, 2020 09:05AM Mar 3, 2020 10:10AM 1.48 2173.30 4.4 5.75 5.05 Normal
Feb 18, 2020 09:15AM Feb 25, 2020 09:05AM 0.30 61.10 Insuffient sample available for field measurements.
Feb 11, 2020 10:00AM Feb 18, 2020 09:15AM 0.07 14.80 Insuffient sample available for field measurements.
Feb 4, 2020 10:30AM Feb 11, 2020 10:00AM 2.34 1635.30 2.8 5.56 4.93 Normal
Jan 28, 2020 09:20AM Feb 4, 2020 10:30AM 0.01 4.50 Insuffient sample available for field measurements.
Jan 21, 2020 09:55AM Jan 28, 2020 09:30AM 0.88 1181.30 4.8 5.13 5.02 Normal
Jan 14, 2020 09:55AM Jan 21, 2020 09:55AM 0.69 510.40 4.7 5.31 4.95 Normal
Jan 7, 2020 09:30AM Jan 14, 2020 09:55AM 2.05 2764.10 3.4 5.33 4.88 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