hand holding air quality monitoring device shown high number of pm2.5 dust at carpark with smoke effect

air alarm allergy background bokeh building car carpark city concept dangerous depth detector device digital disease display dust effect environment field fog global hand haze health high hold holding humidity inhale life lot lung matter meter mist monitor monitoring number outdoor park parking particulate pm25 pollution poor problem quality screen shallow shown sign smog smoke symbol technology temperature toxic trouble unhealthy urban warming warning weather