The pollution was traced to an industrial park, and factories in the park were ordered to stop discharging the chemical.

该园区的工厂被下令停止排放化学物质。

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The source of pollution comes from the industrial wastewater of Jilin Chemical Engineering Company.

污染源主要来自吉林化学工业公司排放的工业废水。

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For the industrial pollution sources locating in the zone of municipal wastewater collecting system, effects of instant or accidental discharge of chemical compounds must be assessed.

位于城市污水处理厂污水收集系统区域内的工业污染源，必须考虑其突发性或间歇排放的化学物质对污水处理的影响。

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What ails Modesto is what ails Bakersfield (No. 1), Hanford (No. 3), Fresno (No. 4) and other small Central Valley cities (the Valley accounts for all the California cites on the list aside from Los Angeles): heavy doses of nitrogen oxide and hydrocarbons stemming from gasoline, chemical processing, paints and other industrial byproducts that harm the ozone and release particle pollution into the air.

FORBES: The Worst Cities In America For Your Lungs