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

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