Experts say, observation statistics and researches of 13 years show that the frequency of acid rain in Beijing-Tianjin-Hebei region and part of Henan province has increased by over 20% to 50% ever since 2003, with a more noticeable acidification tendency
Experts say, observation statistics and researches of 13 years show that the frequency of acid rain in Beijing-Tianjin-Hebei region and part of Henan province has increased by over 20% to 50% ever since 2003, with a more noticeable acidification tendency
专家介绍，13年来的观测数据和研究资料显示，2003年以来，包括北京在内的京津冀地区及河南部分地区的酸雨发生频率增加了20%到50%以上，而北京的雨水酸化趋势更是明显，并出现了强酸雨。