expanded their definition of close contact to include people whose cellphone signals were recorded within as much as half a mile of an infected person.

The party’s experiment in using data to control the flow of people has helped keep Covid at bay. Now these same tools potentially give officials greater power to manage other challenges.

as a model for how China can use technology to address social problems.

Since 2020, Hangzhou has also used video cameras on streets to check whether residents are wearing masks. One district monitored home power consumption to check whether residents were sticking to quarantine orders. The central city of Luoyang installed sensors on the doors of residents quarantining at home, in order to notify officials if they were opened.

crashed twice in two weeks, disrupting the lives of residents who had to update their apps each day with proof that they had taken Covid tests.

By focusing on technology and surveillance, Chinese officials may be neglecting other ways of protecting lives, such as expanding participation in public health programs, wrote Chen Yun, a scholar at Fudan University in Shanghai, in a recent assessment of China’s response to Covid.

state media — roughly one in every 250 adults. Under the grid management system, cities, villages and towns are divided into sections, sometimes of just a few blocks, which are then assigned to individual workers.

During normal times, their duties included pulling weeds, mediating disputes and keeping an eye on potential troublemakers.

Amid the pandemic, those duties mushroomed.

take out their trash.

They also were given powerful new tools.

The central government has directed the police, as well as internet and telephone companies, to share information about residents’ travel history with community workers so that the workers can decide whether residents are considered high-risk.

a woman who was eight months pregnant because her Covid test result had expired hours earlier. She lost the baby, an episode that inspired widespread public fury. But some blamed the heavy burden placed upon low-level workers to stamp out infections.

“In their view, it’s always preferable to go too far than be too soft-handed, but that’s the pressure created by the environment nowadays,” Li Naitang, a retired worker in Xi’an, said of local officials.

Still, for defenders of China’s stringent measures, the results are undeniable. The country has recorded only 3.3 coronavirus deaths per million residents, compared to about 2,600 per million in the United States. In mid-January, Xi’an officials announced zero new infections; this past week, the lockdown was lifted entirely.

The government’s success in limiting infections means its strategy has earned something that has proved elusive in many other countries: widespread support.

published an analysis of each province’s criteria for a health code to turn from green to yellow. It concluded that, for most provinces, the answer was unclear.

“You never know if your planned itinerary will be canceled, or if your travel plans can be realized,” the article said.

local news report. Eighteen summonses were successfully delivered as a result.

Local governments across China have sought to assure people that their health code data will not be abused. The central government has also issued regulations promising data privacy. But many Chinese people assume that the authorities can acquire whatever information they want, no matter the rules.

Zan Aizong, a former journalist in Hangzhou, says the expansion of surveillance could make it even easier for the authorities to break up dissenters’ activities. He has refused to use the health code, but it means moving around is difficult, and he finds it hard to explain his reasoning to workers at checkpoints.

“I can’t tell them the truth — that I’m resisting the health code over surveillance,” he said, “because if I mentioned resistance, they’d think that was ridiculous.”

Joy Dong, Liu Yi and Li You contributed reporting and research.

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