Skip First Level Navigation | Skip All Navigation

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]

Download Data

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:
Aug 19, 2014 09:00AM Aug 26, 2014 09:00AM 0.00 0.00 Insuffient sample available for field measurements.
Aug 12, 2014 09:20AM Aug 19, 2014 09:00AM 1.09 1830.60 5.2 5.10 4.95 Normal
Aug 6, 2014 09:00AM Aug 12, 2014 09:20AM 0.44 139.20 9.8 4.97 4.83 Mildly Acidified
Jul 29, 2014 09:40AM Aug 6, 2014 09:00AM 4.65 890.70 7.10 4.42 5.09 Moderately Acidified
Jul 22, 2014 09:20AM Jul 29, 2014 09:40AM 2.98 3842.80 3.7 4.95 5.18 Mildly Acidified
Jul 15, 2014 09:50AM Jul 22, 2014 09:20AM 0.38 656.00 7.5 4.88 4.97 Mildly Acidified
Jul 8, 2014 08:57AM Jul 15, 2014 09:50AM 0.00 124.60 6.7 5.01 4.43 Normal
Jul 1, 2014 09:00AM Jul 8, 2014 08:57AM 0.00 0.00 Insuffient sample available for field measurements.
Jun 24, 2014 09:00AM Jul 1, 2014 09:00AM 0.67 1063.80 6.7 4.95 5.03 Mildly Acidified
Jun 17, 2014 10:05AM Jun 24, 2014 09:00AM 0.54 941.70 10.5 5.06 4.98 Normal
Jun 10, 2014 01:00PM Jun 17, 2014 10:05AM 1.58 1530.40 8.5 5.02 4.89 Normal
Jun 3, 2014 10:40AM Jun 10, 2014 01:00PM 0.57 844.30 14.4 4.61 4.91 Moderately Acidified
May 27, 2014 02:25PM Jun 3, 2014 10:40AM 0.29 513.20 16.3 4.64 4.99 Moderately Acidified
May 20, 2014 10:30AM May 27, 2014 02:25PM 0.57 737.30 7.6 4.94 4.91 Mildly Acidified
May 13, 2014 09:00AM May 20, 2014 10:30AM 1.52 2471.70 17.4 4.66 4.82 Moderately Acidified
May 6, 2014 10:30AM May 13, 2014 09:00AM 0.28 445.20 7.8 4.94 4.92 Mildly Acidified
Apr 29, 2014 04:30PM May 6, 2014 10:30AM 0.72 1185.60 11.6 4.81 4.88 Mildly Acidified
Apr 22, 2014 10:30AM Apr 29, 2014 04:00PM 1.91 2671.00 6.3 5.09 4.80 Normal
Apr 15, 2014 10:00AM Apr 22, 2014 10:30AM 3.59 1051.40 13.2 4.68 4.94 Moderately Acidified
Apr 9, 2014 08:50AM Apr 15, 2014 10:00AM 1.14 994.80 7.9 4.96 4.93 Mildly Acidified
Apr 1, 2014 02:10PM Apr 9, 2014 08:45AM 1.08 630.00 11.7 4.81 4.89 Mildly Acidified
Mar 25, 2014 02:05PM Apr 1, 2014 02:10PM 2.72 1341.50 6.40 5.08 4.81 Normal
Mar 18, 2014 10:00AM Mar 25, 2014 02:05PM 1.42 1826.20 11.6 4.76 4.95 Mildly Acidified
Mar 11, 2014 09:00AM Mar 18, 2014 10:00AM 1.59 1194.70 3.4 5.17 4.90 Normal
Mar 4, 2014 09:45AM Mar 11, 2014 09:00AM 0.14 143.30 4.5 5.15 4.92 Normal
Feb 25, 2014 09:45AM Mar 4, 2014 09:45AM 0.04 108.90 4.9 5.08 4.93 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