_________________________ The World Health Organisation is warning air pollution is putting the health of millions of people at risk. Lisa Schlein has details. Data from a survey of 1,600 cities across 91 countries reveal people living in the cities are breathing in dirty air. The World Health Organization says this puts millions at risk of serious long-term health problems. WHO public health and environment director Maria Neira calls this a major public health issue. "The situation we have in front of us tell us that globally unfortunately the situation on air pollution is deteriorating." __________________________ 世界卫生组织警告称空气污染正给数百万人的身体健康带来风险.丽莎`施莱恩为您报道更多细节.一份取自91个国家1600座城市的调查数据显示居住在城市的居民呼吸着污浊的空气.世界卫生组织称,这将使数百万人面临严重长期的健康风险问题.公共健康与环境主管玛利亚`内拉称这是重大的公共卫生问题."很不幸,目前我们正面临全球空气污染不断恶化的情况."