Earth Changes
"We're currently facing unusual conditions, with one of the driest Junes in over 40 years as well as really bad air circulation conditions in the Santiago valley in recent days, which boosts the concentration of contamination," the Environment Ministry said in a statement.
The emergency, the first since 1999, will be in place for 24 hours and can be extended further if authorities deem conditions have not improved.
The Environment Ministry could not immediately provide Reuters with a list of what industries will be forced to suspend operations on Monday.

Edhi Welfare Organisation, Pakistan's largest charity, said their mortuary had been packed to capacity due to heatwave-related deaths.
Sindh province's Health Secretary Saeed Mangnejo told AFP news agency that the provincial government had imposed a state of emergency at all hospitals, cancelling leave for doctors and other medical staff and increasing stocks of medical supplies.
The southern port city of Karachi saw temperatures reach as high as 45 degrees Celsius on Saturday, just short of an all-time high of 47C in June 1979.
Dr Seemin Jamali, the head of the emergency department at state-run Jinnah Hospital said more than 100 people had died at the hospital.

A swarm of bees took to the main Senate entrance of the U.S. Capitol Building on Friday, frightening onlookers before they were captured.
Three volunteer beekeepers, including one who is a top congressional aide, worked carefully but without protective suits to capture the queen and her thousands of offspring.
The bees had been out of their nest in search of a new, larger home, according to Rachel Perry of Capitol Bee Care, an organization that works to protect honey bee colonies that, for a variety of reasons, are dying off in large numbers. Wearing just a scarf hanging over her head, Perry sat patiently beneath the tree luring the bees into a hole in a medium-sized cardboard box that was sealed with gaffers tape, gently nudging with a brush the last stragglers inside.
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These beautiful pictures show a rainbow.
But possibly no rainbow you've ever seen before.
Vicki Haines took a couple of pictures of a rainbow entirely circling the sun form her back garden in Tewkesbury
And nearby in Bishop's Cleeve Lesley Cairns also captured the celestial phenomenon, known as a halo.
It is caused by the presence of high cirrus clouds containing ice crystals which are refracting the sun's light and causing the appearance of the rainbow halo.
Sometimes a halo can also be seen around the moon and the legend is: 'a ring around the moon means rain will come soon.'
Which is all very well, but what about the leprechauns? (Is it leprechauns with rainbows, we might be a bit mixed up.)
Recently, Chile's Calbuco volcano erupted twice, prompting a large evacuation, and fears were ignited after experts revealed Indonesia's Mount Sinaburg may soon erupt.
Hundreds of volcanoes dot the globe, but only a handful are known for their particularly violent pasts. Some of these infamous peaks have caused mass casualties; others have destroyed whole cities.
Here are 12 of the world's most dangerous volcanoes, which could erupt at any time, and a brief history of their explosive power.
1. Cumbre Vieja Volcano - La Palma, Canary Islands, Spain

Satellite photo of Caldera de Taburiente and Cumbre Vieja, La Palma, Canary Islands.
Peter Coade, a CBC meteorologist, said fire rainbow is a rare phenomenon that is formally known as circumhorizontal arc.
Coade said the colourful cloud formation requires very specific conditions to be in place.
"When the sun is very high in the sky, sunlight entering flat, hexagon shaped ice crystals gets split into individual colours just like in a prism," he said.
"The conditions required are very precise - the sun has to be at an elevation of 58° or greater, there must be high altitude cirrus clouds with plate-shaped ice crystals and sunlight has to enter the ice crystals at a specific angle."
The scale of the volcano's first eruption in 20 days was smaller than its May 29 blast but apparently took from 12:17 p.m. to around 12:47 p.m. to complete, the weather agency said.
Initially, the agency had difficulty confirming the eruption because of bad weather, but a Japan Coast Guard vessel reportedly confirmed seeing small rocks falling while on patrol about 9 km east of the volcano.
The eruption follows the volcano's mighty blast in May, which forced the sparsely populated island's residents to flee to neighboring Yakushima Island. Although the agency had said volcanic activity on Kuchinoerabu had halted since last month's blast, earthquakes started rattling the area earlier this week, with 10 on Tuesday, 31 on Wednesday and seven by 9 a.m. Thursday, the agency said.
Kuchinoerabu's eruption alert remains at 5, the highest level, and residents in the area have been warned to remain alert for further eruptions.
A recent study conducted by the World Wide Fund for Nature-Pakistan (WWF-Pakistan) and funded by the Australian Marine Mammal Centre, found that dolphins were frequently getting enmeshed in tuna gillnets due to Pakistan's fishing practices.
The study- An Assessment of Cetacean Mortality in the Tuna Fisheries of Pakistan ,found that the use of tuna gillnets in fishing practice was marred with high bycatch of dolphins, turtles and other cetaceans; due to operations which are non compliant to United Nations General Assembly (UNGA) regulations which prohibit the use of large scale driftnets on high seas.
Tuna fishing in Pakistan is based on large scale gillnets which increases the interaction between dolphins and the gillnet. Between Iran and Pakistan, it is estimated that there are more than 7,000 operational gillnets.
With approximately 500 vessels dedicated to catching tuna along the coast, the length of the gillnet was observed to be longer than 2.5 kilometres, much higher than the average, and large scale gillnetting is more harmful to non-target species especially cetaceans.












Comment: Are we ready for the next volcanic catastrophe?