About the pollution caused due to light across the world and it seems to be our very basic need of our life.

1. Light pollution
Done by:
S.Anitha Devi

2. What is light pollution?
Light pollution is excessive, misdirected,
or obtrusive artificial (usually outdoor) light.
Too much light pollution has consequences: it
washes out starlight in the night sky, interferes with astronomical
research, disrupts ecosystems, has adverse health effects
and wastes energy.

3. Why Lightpollutionisa problem?
Light pollution is not only a hinderance to astronomy,
but it also impacts us directly.

4. Effectsof Light pollution:
•is a risk factor for cancer to people
•is a disturbance to animals
•is a waste of energy, resources, and money
•is a security risk to your property
•and obscures our view of the wondrous night sky.

5. What is the maincause of lightpollution?
It is caused as a result of industrialization and modernization.
It can be caused by various sources of light.
The intrusive light falling inside our rooms from outside at night
is a kind of light pollution called light trespass. Large industrial
and residential areas cause light clutter.

6. LIGHT POLUTIONMAP

7. The most light-polluted
places in the world
Humanity is losing its ability to see the stars.
According to an unprecedented new map of
light pollution, published by the
journal Science Advances in June, some of the
most populated areas of Earth no longer
experience nighttime darkness.
In fact, more than 80% of us live under light
polluted skies while 99% of people living in
Europe and the United States are affected by
it. And perhaps 1/3 of humanity can no longer
see the Milky Way — the closest (and
brightest) galaxy to our planet.
But light pollution doesn't just rob us of
beautiful nighttime vistas and get in the way of
astronomy: It also kills 300 million to 1 billion
birds each year, wastes billions of dollars'
worth of energy in the US annually, and keeps
humans from sleeping well (we need complete
darkness for our bodies to effectively release
the hormones necessary for sleep).

8. A) Europehas some of the worst lightpollution
on the planet.In fact, almost the entire
continentis bathed in an uninterruptednighttime
skyglow.

9. B)Some of the heaviest light pollution
occursalong the borderof Germany, Belgium and
the Netherlands,especially
around Amsterdam.

11. c) The country's worst light
pollution occurs over an uninterrupted
urban area that stretchesfrom Washington D.C.,
through Baltimore,Philadelphia,and New York,
and allthe way up to Boston.

12. d)Southern and eastern Asia appearto sufferless from
light pollution than other areas,though Hong Kong
(bottom) and Shanghai(centerright)—as well as the
majorcitiesof South Korea(top right) — don't escapethe

13. glow of artificial lighting

14. e)North Korea turns off most of its
lights during the evening, so it's pitch-blackon
the map — provingexperts' argumentthat
turning off lights is one of the most

15. effective ways toreduce lightpollution

16. Hyiung hon bazar

17. How we can control lightpollution?
1. Start with the light switch.
2. Check with your power company to see if you're paying for
outdoor lighting.
3. Consider replacing outdoor lights with intelligently designed,
low-glare fixtures.
4. Place motion sensors on essential outdoor lamps.
5. Replace conventional high-energy bulbs with efficient outdoor
CFLs and LED floodlights.

18. NOTE:
Fighting light pollution does not mean turning all
the lights off. It's about being sensibleabout our
lighting choices.

20. THANK YOU