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Nitro is a city in Kanawha and Putnam counties in the U. S. state of West Virginia. It takes its name from a World War I era nitrocellulose plant. The population was 6,618 according to the 2020 census. The Nitro area was to be the American ammunition production facility during World WarI. Daniel C. Jackling "supervised the construction and operation" of the plant, which by the time of the armistice "was producing one hundred thousand pounds of high explosives per day." Its name was selected by the United States government because of the establishment there, during World WarI, of a large federal plant for the manufacture of explosives. The city is known as "a Living Memorial to World WarI."

Nitro is located at (38.415281, 81.831249), primarily in Kanawha County. According to the United States Census Bureau, the city has a total area of 4.67 square miles (12 km2), of which 4.28 square miles (11 km2) is land and 0.39 square miles (1 km2) is water. The city lies across the Kanawha River from the city of St. Albans to the south, and is adjacent to the census designated place of Cross Lanes.

Nitro is a part of the Huntington Ashland, WV KY OH, Metropolitan Statistical Area (MSA). As of the 2010 census, the MSA had a population of 287,702. New definitions from February 28, 2013, placed the population at 363,000.

As of the census of 2010, there were 7,178 people, 3,250 households, and 1,914 families living in the city. The population density was There were 3,507 housing units at an average density of The racial makeup of the city was 94.7% White, 2.3% African American, 0.5% Native American, 0.6% Asian, 0.6% from other races, and 1.4% from two or more races. Hispanic or Latino of any race were 1.6% of the population. There were 3,250 households, of which 25.9% had children under the age of 18 living with them, 41.4% were married couples living together, 12.8% had a female householder with no husband present, 4.8% had a male householder with no wife present, and 41.1% were non families. 33.9% of all households were made up of individuals, and 12.8% had someone living alone who was 65 years of age or older. The average household size was 2.21 and the average family size was 2.82. The median age in the city was 40.5 years. 20.4% of residents were under the age of 18; 7.4% were between the ages of 18 and 24; 27.2% were from 25 to 44; 27.7% were from 45 to 64; and 17.3% were 65 years of age or older. The gender makeup of the city was 47.9% male and 52.1% female.

As of the census of 2000, there were 6,824 people, 3,015 households, and 1,935 families living in the city. The population density was 1,821.2 people per square mile (702.6/km2). There were 3,217 housing units at an average density of 858.6 per square mile (331.2/km2). The racial makeup of the city was 96.64% White, 1.63% African American, 0.25% Native American, 0.25% Asian, 0.40% from other races, and 0.84% from two or more races. Hispanic or Latino of any race were 0.54% of the population. There were 3,015 households, out of which 23.9% had children under the age of 18 living with them, 47.3% were married couples living together, 12.7% had a female householder with no husband present, and 35.8% were non families. 30.7% of all households were made up of individuals, and 13.9% had someone living alone who was 65 years of age or older. The average household size was 2.26 and the average family size was 2.80. The age distribution was 20.1% under the age of 18, 8.8% from 18 to 24, 26.4% from 25 to 44, 26.1% from 45 to 64, and 18.7% who were 65 years of age or older. The median age was 41 years. For every 100 females, there were 89.7 males. For every 100 females age 18 and over, there were 87.0 males. The median income for a household in the city was $32,389, and the median income for a family was $41,367. Males had a median income of $30,086 versus $21,932 for females. The per capita income for the city was $17,453. About 7.3% of families and 10.7% of the population were below the poverty line, including 12.5% of those under age 18 and 14.0% of those age 65 or over.

The reach of the Kanawha River Valley between Belle and Nitro is known locally as the "Chemical Valley", which, at its peak in the late 1950s and early 1960s, was the leading producer of chemicals in the world (Henry, 1974). During World WarI the government built an $80 million complex in Nitro to manufacture explosives and chemicals for the war effort. The site was located on an cow pasture on the Kanawha River on the flat river valley floodplain. The facility had just been placed in operation when the war ended in November 1918. The first shipment of powder was also the last. Local authorities then sought various chemical companies to occupy the facility which had excellent infrastructure in utilities, transportation and new housing for workers. It was hoped that the former gunpowder complex would become a major chemical manufacturing center, especially for the emerging dye industry in the U. S. that relied on coal and coke by products as feedstock. The Kanawha River and water in the adjacent alluvium have been adversely affected by industrial activities (Messinger, 1997). The chemical manufacturing history of Nitro resulted in environmental impairment, including the Fike/Artel Chemical Site (EPA ID: WVD047989207), which is on the National Priorities List Superfund. The site was placed on the EPA National Priorities List in 1983. The site is a former World WarI chemical munitions plant at which subsequent chemical manufacturing, reclamation and disposal was allegedly conducted. The Solutia Inc. Nitro Plant, located on the east bank of the Kanawha River approximately one half mile north of the City of Nitro in Putnam County, is being investigated through the RCRA program. From 1918 to 1921, the facility manufactured explosives including "nitro powder" to support World WarI. When explosives manufacturing processes ceased, the facility was purchased and used for a variety of industries. In 1971, the buildings were used by a heavy chemical company Fike Chemical and further investigation showed improper waste remediation. RCRA Corrective Action activities at this facility are being conducted under the direction of EPA Region 3 and the West Virginia Department of Environmental Protection. Other RCRA Corrective Action facilities include Great Lakes Chemicals Company (formerly FMC Corporation) and Union Carbide Corp. PTO (a subsidiary of The Dow Chemical Company). Due to manufacturing activities, Nitro became known for a distinctive chemical smell—especially in the area of the I 64 bridge. However, the recent shift away from manufacturing in the region has significantly reduced air pollution issues.

In February 2012, Monsanto agreed to settle a case covering dioxin contamination around a plant in Nitro that had made Agent Orange. Monsanto agreed to pay up to $9 million for cleanup of affected homes, $84 million for medical monitoring of people affected, and the community's legal fees.

In 2001 Clonaid operated a lab in Nitro that was tied to the Raelians. It was located inside a rented room within a former high school. The FDA said that the equipment in the lab was state of the art and had been bought by former West Virginia state legislator Mark Hunt.

For over 50 years, the Monsanto plant in Nitro, West Virginia, created dioxin waste while producing herbicides, Agent Orange (during the Vietnam War), and different forms of rubber. Recent and past literature has established a link between the Monsanto plant and increased cancer cases within the region. Although evidence seems to support the occurrence of clustering within the Nitro and Saint Albans areas, further epidemiological and spatial studies are required.