San Francisco smells like rotten eggs and nobody knows why

A mysterious smell coursing through San Francisco, California is stinking up the city and annoying residents.

The odor of rotten eggs was first detected last Wednesday night.

Officials first investigated the nearby Chevron oil refinery and found that although there was an incident involving burning off excess gas, this was not the cause of the odor.

Investigators are still looking into wind and weather reports from when the smell began, as well as inspecting landfills, water treatment plants and ships.

The Pacific Gas and Electric Company has also ruled out a gas leak as the root of the smell and, although the situation literally stinks for residents of San Fran, it is not considered to be a health hazard.

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San Francisco, California

Golden Gate Bridge over San Francisco Bay, California, United States

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San Francisco skyline at sunrise from Marin Headlands, San Francisco, California, USA

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Skyline of Financial District, San Francisco, California, USA.

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Old houses in Alamo Square, known as the Painted Ladies, San Francisco, California, United States

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Alamo Square, Painted Ladies, Postcard Row, San Francisco

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Downtown San Francisco as seen from Twin Peaks. Market Street cuts straight down the center of the frame, and in the background the Berkeley and Oakland hills can be seen across the bay, on the other side of the Bay Bridge.

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USA, California, San Francisco, View of full moon over Golden Gate Bridge

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The Golden Gate Bridge from Baker's Beach in San Francisco, California, USA

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Skyline of San Francisco at dusk

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Embarcadero Center is a group of office towers and hotels located near the Ferry Building and the Embarcadero in San Francisco. The complex intersects the daily business of the Financial District with tourists and travelers from around the world. The Embarcadero Center towers have edge lighting which is illuminated during the holiday season in November and December.

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