The urban air quality remained stable,with a wide range of particulate pollution. The cities with the urban air quality attaining the national standards of Grade II and III and exceeding Grade III accounted for one third separately.

• 城市空气质量基本稳定，颗粒物污染范围较广，城市空气质量满足国家二级标准、三级标准和超过三级标准的城市比例各占三分之一。