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Bortle scale: A way to assess and monitor the urban nightsky

Frank Fitzgerald Batin, Rose Ann Bautista, Ruby-Ann Dela Cruz, Jason Kalaw, Frank Kelvin Martinez, Princess Tucio

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J. Bio. Env. Sci.19(5), 88-95, November 2021


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The skylines of the cities in Metro manila are towering buildings. Each city in it is peppered with high-rise buildings for business, commercial and residential purposes. The nighttime in these cities is as busy as daytime, the nighttime in these cities became as bright as daytime. A large percentage of the observers hail within Metro Manila. These respondents have scaled their night sky as BS7 which is characterized as City/Suburban Transition where light pollution makes the entire skylight gray, strong light sources are evident in all directions and the Milky Way is nearly or totally invisible. There’s also a big percentage of respondents coming from the outskirts of Metro Manila, these respondents have scaled their night sky as BS6 which is characterized as Bright Suburban Sky wherein the zodiacal light is invisible, clouds anywhere in the sky are fairly bright, and high clouds (cirrus) are brighter than the sky background. Also, there was a fairly large percentage of the respondents from provinces like Bulacan and Pampanga 2.5 to 3.5 hours away from Metro manila who scaled their night sky as BS which is characterized as Suburban Sky that can be described with light pollution that is visible in most directions, clouds are brighter than the sky, the light coming from the Milky Way is very weak near the horizon. Provinces that are 4 to 7 hours or more away from Metro Manila were scaled significantly lower or with darker night skies than provinces near Metro Manila.


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Bortle scale: A way to assess and monitor the urban nightsky

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