بيانات جودة الهواء مقدمة من: the Henan Environmental Protection Agency (河南环保 > 网站首页) (sthjt.henan.gov.cn) and the Weather Underground (wunderground.com) and the China National Urban air quality real-time publishing platform (全国城市空气质量实时发布平台) (113.108.142.147:20035)