Ключевые слова: air pollution, air quality, black, blurred background, botany, caring, closeup, copy space, daytime, detector, device, digital, display, electronic, environment, equipment, finger, foliage, freshness, garden, good, green, hand, health, holding, index, lifestyle, man, measurement, measuring, meter, modern, monitoring, outdoor, park, particulate matter, people, person, plants, pm 25, selective focus, sensor, technology, test, tree, weather, white, yard,