Highways, homes and schools all over China are near warehouses licensed to handle hazardous substances.

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HONG KONG — The warehouse in Tianjin that exploded Aug. 12 was one of many buildings across China that store toxic chemicals near residential areas or major roads, in violation of safety regulations, according to a review of satellite imagery and public records.

Highways, homes and schools all over China are near warehouses licensed to handle hazardous substances.

According to Chinese officials, the warehouse in Tianjin, a major port city, stored at least 700 tons of one common deadly chemical, sodium cyanide, used in mining to separate gold and silver from rock.

After the deadly explosions, residents of Tianjin have been gripped by fear and uncertainty over the presence of toxic chemicals in the city’s air and water, setting off a national debate about hidden hazards along the supply route for sodium cyanide. On Saturday, Chinese state media reported another explosion at a chemical plant in the eastern province of Shandong, according to The Associated Press.

At least nine people were injured in the explosion in the Shandong province city of Zibo, according to the official Xinhua news agency. No deaths were immediately reported.

A dozen fire engines were battling the blaze caused by the explosion, Xinhua said.

It was not immediately clear what chemicals were at the plant at the time of the incident. Zibo is a major storage site for fuel oil and chemicals in the region.

Chinese regulations forbid facilities with hazardous chemicals to operate within two-thirds of a mile of public buildings and major roads.

An accident at such a storage site could be disastrous. The blasts in Tianjin killed more than 100 people, injured hundreds more and turned the surroundings into wasteland. Experts said some of the sodium cyanide might have combined with water to form a toxic vapor.

Thousands of dead fish washed up last week on a riverbank near the site of the explosions. White foam filled the streets during the first rain shower after the blasts. Residents and relatives of those killed have taken to the streets in protest, demanding to know how a hazardous-storage site could be so close to their homes.

The sodium cyanide stored at the warehouse originated at a factory 200 miles west of Tianjin. Chinese news media reported a foul odor near the factory, and residents said they had found white foam in the groundwater. Some complained of headaches.

The company, Hebei Chengxin, is one of the largest makers of the toxic substance in Asia. Its sprawling facility is close to a primary school with up to 700 students and employees. Company officials could not be reached for comment.

The plant’s apparent violation of the distance rules reflects China’s difficulties in enforcing safety standards during its rapid industrialization. In May, the Ministry of Environmental Protection issued draft guidelines for improving environmental safeguards in industrial parks, noting that some had “expanded recklessly.” Such parks “create serious pollution and severe environmental hazards that are affecting social harmony and stability,” the guidelines warned.

Greenpeace said Friday that it had identified warehouses for hazardous chemicals in four other major port cities: Shanghai, Guangzhou, Ningbo and Qingdao. All are near residential areas.

Several other facilities across China that produce or store sodium cyanide and other hazardous chemicals appear to violate distance regulations, putting nearby residents at risk of toxic exposure.

Sodium cyanide was only one of the chemicals stored at the warehouse in Tianjin, owned by Rui Hai International Logistics. But it is remarkably lethal: A quarter of a teaspoon, if ingested, will kill an adult in a few minutes.

Officials have not explained why the warehouse was allowed 2,000 feet from a high-rise apartment complex. Residents said they had no idea that the warehouse posed a risk.

Satellite images show two other hazardous-goods warehouses in Tianjin less than 3 miles from the blasts. The warehouses, managed by companies under the state-owned Sinochem Group, advertise that they can store hazardous chemicals. One is near a kindergarten; the other sits next to a major highway. Employees at both warehouses declined to comment.

The blasts in Tianjin have prompted officials to conduct surveys on sites across the country that store hazardous chemicals. During one such inspection in Wuhan, authorities found such a site just across the street from a residential compound.

Inspectors chastised managers at the company, Wuhan International Container, for violating basic safety standards, including failing to maintain an inventory and store chemicals separately, according to Chinese news-media reports last week. On Thursday, the city of Wuhan revoked the company’s license to store explosive chemicals. The company did not return phone calls.

Another major producer of sodium cyanide, Anhui Shuguang, appears to have a subsidiary close to a residential area of Anqing in Anhui province, and only a few hundred feet from the Yangtze River in central China.

A kindergarten and another school are close to the factory. The company did not respond to questions sent by email, and a person who answered the phone declined to comment.