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Forest fires have a profound impact on the atmospheric environment and airquality across the ecosystems. The recent west coast forest fire in the UnitedStates of America (USA) has broken all the past records and caused severeenvironmental and public health burdens. As of middle September, nearly 6million acres forest area were burned, and more than 25 casualties werereported so far. In this study, both satellite and in-situ air pollution datawere utilized to examine the effects of this unprecedented wildfire on theatmospheric environment. The spatiotemporal concentrations of total six airpollutants, i.e. carbon monoxide (CO), nitrogen dioxide (NO2), sulfur dioxide(SO2), ozone (O3), particulate matter (PM2.5 and PM10), and aerosol index (AI),were measured for the periods of 15 August to 15 September for 2020 (fire year)and 2019 (reference year). The in-situ data-led measurements show that thehighest increases in CO (ppm), PM2.5, and PM10 concentrations ({\mu}g/m3) wereclustered around the west coastal fire-prone states, during the 15 August - 15September period. The average CO concentration (ppm) was increased mostsignificantly in Oregon (1147.10), followed by Washington (812.76), andCalifornia (13.17). Meanwhile, the concentration ({\mu}g/m3) in particulatematter (both PM2.5 and PM10), was increased in all three states affectedseverely by wildfires. Changes (positive) in both PM2.5 and PM10 were measuredhighest in Washington (45.83 and 88.47 for PM2.5 and PM10), followed by Oregon(41.99 and 62.75 for PM2.5 and PM10), and California (31.27 and 35.04 for PM2.5and PM10). The average level of exposure to CO, PM2.5, and PM10 was alsomeasured for all the three fire-prone states. The results of the exposureassessment revealed a strong tradeoff association between wildland fire andlocal/regional air quality standard.

Effects of West Coast forest fire emissions on atmospheric environment: A coupled satellite and ground-based assessment