Final answer:
Niland Geyser is a man-made geothermal feature in California that releases hydrogen sulfide gas, which can have health effects. However, it is located in a remote area and is not considered a major health concern.
Step-by-step explanation:
Niland Geyser, also known as the 'Salton Sea Volcano', is a man-made geothermal feature located in California, USA. It was created accidentally in 2005 when attempts to drill a well for oil and gas resulted in a blowout, causing hot water and gas to erupt from the ground and forming a geyser.
In terms of health concerns, the Niland Geyser emits hydrogen sulfide gas, which can cause respiratory irritation and other health issues if exposed to in high concentrations. However, the geyser is located in a remote area and the gas dispersion is typically not a significant threat.
Therefore, while the Niland Geyser can have some impact on health due to the release of hydrogen sulfide, it is not considered a major public health concern and its effects are generally limited to the immediate vicinity.