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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:
Oct 20, 2009 10:58AM Oct 27, 2009 10:07AM 2.09 3136.70 16.3 5.08 4.86 Normal
Oct 13, 2009 12:50PM Oct 20, 2009 10:58AM 0.02 22.10 Insuffient sample available for field measurements.
Sep 29, 2009 09:50AM Oct 6, 2009 12:10PM 2.13 3048.90 7.1 5.22 5.01 Normal
Sep 22, 2009 08:29AM Sep 29, 2009 09:50AM 1.21 1742.20 12.2 4.93 4.82 Mildly Acidified
Sep 15, 2009 10:26AM Sep 22, 2009 08:29AM 0.24 421.30 9.1 5.01 4.55 Normal
Sep 8, 2009 02:52PM Sep 15, 2009 10:26AM 0.03 60.30 Insuffient sample available for field measurements.
Sep 1, 2009 09:34AM Sep 8, 2009 02:52PM 0.00 0.00 Insuffient sample available for field measurements.
Aug 25, 2009 09:22AM Sep 1, 2009 09:34AM 0.28 460.00 7.5 5.02 5.22 Normal
Aug 18, 2009 08:59AM Aug 25, 2009 09:22AM 5.57 1149.40 15.9 5.05 5.20 Normal
Aug 11, 2009 09:37AM Aug 18, 2009 08:59AM 0.00 0.00 Insuffient sample available for field measurements.
Aug 4, 2009 09:21AM Aug 11, 2009 09:37AM 0.49 782.40 5.5 4.87 4.39 Mildly Acidified
Jul 28, 2009 09:31AM Aug 4, 2009 09:21AM 0.97 1476.20 5.9 5.28 4.76 Normal
Jul 21, 2009 09:02AM Jul 28, 2009 09:31AM 1.66 2117.50 5.0 4.92 4.47 Mildly Acidified
Jul 14, 2009 08:38AM Jul 21, 2009 09:02AM 1.36 2344.80 7.4 4.98 4.76 Mildly Acidified
Jul 8, 2009 09:02AM Jul 14, 2009 08:38AM 3.48 487.50 7.5 4.55 4.72 Moderately Acidified
Jun 30, 2009 09:13AM Jul 8, 2009 09:02AM 0.88 1359.60 15.0 6.53 5.96 Normal
Jun 23, 2009 09:38AM Jun 30, 2009 09:13AM 1.03 1679.70 9.2 6.52 5.74 Normal
Jun 16, 2009 09:39AM Jun 23, 2009 09:38AM 0.79 1058.40 2.2 7.26 5.17 Slightly alkaline
Jun 9, 2009 09:17AM Jun 16, 2009 09:39AM 0.75 1072.70 5.9 5.49 5.67 Normal
Jun 2, 2009 09:30AM Jun 9, 2009 09:17AM 0.07 81.80 7.0 5.77 5.35 Normal
May 19, 2009 11:42AM May 26, 2009 02:10PM 0.14 190.80 7.1 5.66 5.05 Normal
May 12, 2009 09:15AM May 19, 2009 11:42AM 0.69 858.40 7.5 4.94 4.87 Mildly Acidified
May 5, 2009 09:00AM May 12, 2009 09:15AM 1.82 2762.20 8.2 4.86 5.08 Mildly Acidified
Apr 28, 2009 08:40AM May 5, 2009 09:00AM 0.72 1121.50 5.2 5.03 5.07 Normal
Apr 21, 2009 09:43AM Apr 28, 2009 08:40AM 1.40 1782.90 3.7 5.29 5.19 Normal
Apr 14, 2009 09:16AM Apr 21, 2009 09:43AM 0.06 0.00 Insuffient sample available for field measurements.

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

 

Questions about this Service? Contact the Bureau at: (207) 287-2437 or Email: depair@maine.gov