pm 2.5 in sunrise view with the mountain foreground at chiang rai province, north of thailand on 25 mar 2021 morning 7.00 am

unclear layers natural hill peak park mountain scenic air pollution horizon land summer dusk hazard smog carbon polluted health smoke dirty skyline skyscraper toxic dust landmark unhealthy landscape sunset environment outdoor fog background sky pm25 fresh sunlight asia countryside nature sunrise forest silhouette light morning tree thailand beauty 2 5 view foreground chiang rai province north mar 2021 7 00