What are the 4 types of light pollution?

Light pollution is caused by inefficient or unnecessary use of artificial light. Specific categories of light pollution include light trespass, over-illumination, glare, light clutter, and skyglow. A single offending light source often falls into more than one of these categories.

What is light pollution effects?

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.

What is the main cause of light pollution?

Light pollution, or excessive artificial light, is particularly prominent at night. It is mainly caused by misdirected, excessive, inefficient and unnecessary lighting systems. In urban areas where artificial light sources (e.g. street lights) are abundant, the phenomenon is common.

How far away can LA’s sky glow be seen?

200 miles away
The sky glow of Los Angeles is visible from an airplane 200 miles away.

How does drinking unclean water put children at risk?

Authored by. “Drinking unclean water puts children at risk. As children’s bodies aren’t as strong as adults, drinking unsafe water puts children in danger of deadly bouts of diarrhoea, parasites and other water related diseases,” says Sayasin Khongsavath, World Vision Laos’water and sanitation coordinator.

What happens when water is treated with UV light?

It is important to filter water before treatment with a UV light to make sure that all suspended particles are removed. UV light is not a filter so microorganisms and suspended matter will not be removed from the treated water. What happens if the electricity fails?

What kind of light is used to disinfect water?

Ultra Violet (UV) light disinfection is one water treatment system that can be used to remove most forms of microbiological contamination from water. What is UV light? UV light is part of natural sunlight.

How are children affected by unclean water in Laos?

Children and women are often tasked with this, affecting a child’s education and a woman’s income generation activities. The Lao Millennium Development Goal Progress Report also states that when people do access unclean water, they only treat the water and make it clean to drink about half the time.