The agricultural sector has surpassed industry as the top polluter on the mainland. The State Environmental Protection Administration said while industrial pollution had been reduced, chemical fertilisers, pesticides and animal waste were now the nation's most serious environmental hazards, the People's Daily reported. The report said intensive animal farming was proving particularly damaging to the environment. Driven by the nation's increasing demand for meat, huge animal farms are popping up all over the country. The manure they produce emits huge amounts of ammonia nitrogen, which pollutes the surrounding air, while the waste itself contaminates the water table. The report said these farms were major polluters because they were often inappropriately located and did not have waste-disposal facilities. It also highlighted the lack of government policies promoting proper treatment of waste. The China Environment News said one Jiangsu farm with 15,000 pigs produced 120 tonnes of polluted water every day, while farms in one Fujian city produced more than 1.5 million tonnes of manure a year. A recent report by the Chinese Academy of Agricultural Science estimated that such farms across the country produced more than 1.7 billion tonnes of sewage and waste water every year. The report also said only 3 per cent of the livestock sewage was treated. And as the farming sector has become increasingly competitive, pollution caused by agricultural chemicals has risen. Farmers are increasingly turning to highly toxic fertilisers and pesticides in an attempt to boost crop yields. A Chinese Academy of Agricultural Science report said that in 2000, the nation's farmers used about 35 per cent of all fertilisers produced in the world to enrich their land. A recent report said that in 2001, about 696,400 tonnes of pesticides were produced on the mainland, more than three times the 1995 total.