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Acadia
Photo Gallery
Examples of good & bad days |
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example are presented below of the types of visibility
days that tend to occur in Acadia National Park. These
include clear days, "hazy" polluted days, and
naturally-impaired days, such as those with heavy fog
or thick clouds.
For each picture, fine particle
(PM2.5) concentrations and relative humidity (RH) levels
are provided for reference. These variables tend to
have the biggest affect on visibility. Ozone smog concentrations
and visual range estimates are also provided. Ozone
is a clear gas, but has serious health effects and is
a good indicator of the overall level of manmade air
pollution during the time of the photo. Visual range
is estimated by instruments at the park that provide
a consistent set of data, but which sometimes differ
from what a human would observe. The visual range calculation
is based primarily on the amount of fine particles (PM2.5)
in the air and on foggy days perceived visibility may
be much lower than the calculated visual range.
Click on a picture to view
a larger version.
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Clear Day
October 29, 1999
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Clear
Day
November 8, 1999
This is a typical clean, clear day in Acadia. Note
the crispness of the features on the horizon. These
days will have low pollution levels and low humidity.
Visual Range = 199 miles
PM2.5 = 1.4 ug/m3
Ozone = 39 ppb
RH = 39.5%
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Hazy Polluted Day
August 25, 1999
This is a typical hazy polluted day in Acadia. Note
the relatively uniform white haze that obscures the
horizon. The haze tends to diminish slightly at higher
elevations. These events tend to occur on hot and humid
summer days and are affiliated with high ozone, PM2.5,
and RH levels, and winds that transport pollutants from
urban and industrial areas to the southwest.
Visual Range = 30 miles
PM2.5 = 17.1 ug/m3
Ozone = 104 pp
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Foggy Day
October 9, 1999
This is an example of a foggy day in Acadia. It appears
similar to a hazy polluted day, but note how the fog
tends to be more grey than the white haze and how it
does not thin out near the top of the picture. Fog is
most common in the fall and spring. RH will be very
high; ozone will be low; PM2.5 may be moderate or high.
Visual Range = 29 miles
PM2.5 = 9.6 ug/m3
Ozone = 52 ppb
RH = 98%
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