Ключевые слова: air quality, asia, beijing, blue, blue sky, bridge, building, building exterior, car, central area, chalk, city, city building, cloud, cloud layer, color picture, community, congestion, drive, driving, epidemic, fewer cars, haidian, haidian district, high building, highrise building, highway, horizontal composition, houses, living environment, modern, outdoor, overpass, period, ramp, residential, residential building, road, route, sky, slope shape, sunlight, sunny, sunny day, surroundings, the way, traffic, transport, unmanned, unobstructed, uphill, urban area, urban scenery, white clouds,