Fumaroles release steam in Norris Geyser Basin.

Námaskarð is a very active geothermal area on Namafjall mountain which is connected to the Krafla volcano syatem, close to Lake Mývatn area in northeast Iceland. The air in this area smells sulphurous and at times can be quite pungent.

Fumaroles near Svartsengi in Reykjanes

Fumaroles Iceland 16

Large fumarole outside entrance to Kachina Cave

Aden Crater

Potrillo Volcanic Field

Organ Mountains-Desert Peaks National Monument

New Mexico

Yellowstone has many geysers, fumaroles, and hot springs.

I took this video so you could see and hear the fumarole. You can see it, all right, but that's not fumarole you hear. Whoosh! It was windy there.

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Fumaroles and the telltale coloration of the earth, white and ochre and lurid green

Panoramic view of the fumaroles around Kachina Cave

One part of the crater floor is pockmarked with fumaroles. The smell here isn't pleasant!

Fumarole met zwavelafzettingen.

Fumaroles

Námaskarð is a very active geothermal area on Namafjall mountain which is connected to the Krafla volcano syatem, close to Lake Mývatn area in northeast Iceland. The air in this area smells sulphurous and at times can be quite pungent.

Bubbling mudpots, fumaroles, steaming vents, boiling springs and sulphur deposites at the slpoes of Namafjall, Myvatn, Iceland, July 2010

Parque Nacional Rincón de la Vieja

This steaming vent is at the edge of a golf course on the outskirts of the town of Hveragerdi. I assume if you go in it you're forced to drop a shot.

These fumes are very acidic.

I didnt post a picture, but despite hundreds of warnings all around yellowstone (accompanied by illustrations) some morons were walking around, off the path, right up the water. Because the ground around a geyser is all torn up with vents and geyser structures, if you leave the boardwalk, you might fall in. I guess these guys were willing to risk it.

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Fumaroles cast in stone, Crater Lake National Park

Fumarolen in Norðurland eystra, #Iceland

Another photo I took in Hveravellir: you can see the surrounding scenario in this one.

Fumarole with sulfur on the ground, Isla Socorro, Islas Revillagigedo, Mexico

Fumarole Gunnuhver at Reykanes - Iceland

A mudpot, mud pool or paint pot is a sort of hot spring or fumarole consisting of a pool of usually bubbling mud.

Mudpots form in high-temperature geothermal areas where water is in short supply. The little water that is available rises to the surface at a spot where the soil is rich in volcanic ash, clay and other fine particulates. The thickness of the mud usually changes along with seasonal changes in the water table.

The mud takes the form of a viscous, often bubbling, slurry. As the boiling mud is often squirted over the brims of the mudpot, a sort of mini-volcano of mud starts to build up, sometimes reaching heights of 3-5 feet. Although mudpots are often called "mud volcanoes", true mud volcanoes are very different in nature.

The mud is generally of white to greyish color, but is sometimes stained with reddish or pink spots from iron compounds. When the slurry is particularly colorful, the feature is then called a "paint pot".

The geothermal areas of Yellowstone National Park contain several notable examples of both mudpots and paint pots

Geothermal spot noted for its bubbling pools of mud & steaming fumaroles emitting sulfuric gas

The Pinnacles "fossil fumaroles"

A Fumarole on the Shore of Lake Rotomahana