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unmanned aerial vehicle aerial photography Ji'nan: after the spring cold, "Spring City Blue". Xinhua Miu Junyi, Ji'nan Xinhua 23 February, 21, a strong cold wave brought Ji'nan back to winter overnight. After the storm, the temperature continued to rise. 23, Shandong Ji'nan urban area over the "limited edition" blue sky and white clouds, netizens have lamented that "the sky in Ji'nan is simply the appearance of Yan value, let people feel happy." According to the information platform of Shandong city environmental quality information, the air quality AQI index of Ji'nan was lower than 50 in 23 days, and it was in a good state. It was suitable for the public to carry out outdoor sports. 