Zhang Quan, owner of a store in Li's community, said sales of water had been very good since Wednesday, as people bought multiple packs of bottled water.

When ammonia-nitrogen concentrations reach 0.75 milligrams per cubic meter, people can taste it, and if the figure surpasses 1.0, people can smell it, said Gong Jie, chief physician at the Wuhan Center for Disease Control and Prevention.

Wuhan's reading on Tuesday was 1.59 milligrams per cubic meter.

Many residents worried after learning that the water suspensions were related to pollution found in the Hanjiang River.

Zhao of the environmental protection bureau said the cause has not yet been identified. A preliminary investigation showed that pollutants could have entered the channel upstream.

In early April, water delivery to four districts in Lanzhou, Gansu province, was suspended for four days after two water pipelines were contaminated by nearby oil and chemical substances.

From January to March, there were at least 10 incidents related to water quality in which tap water was found with an unusual odor, Beijing-based Oriental Outlook magazine reported.

Questions:

1. What province is Wuhan located in?

2. How many water plants were shut down because of excessive levels of ammonia-nitrogen?

3. Which river contained water pollution?

Answers:

1. Hubei province.

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