Fig. 2: Pacific Northwest time series and trend analysis of atmospheric composition from 2002 to 2018. | Nature Communications

Fig. 2: Pacific Northwest time series and trend analysis of atmospheric composition from 2002 to 2018.

From: New seasonal pattern of pollution emerges from changing North American wildfires

Fig. 2: Pacific Northwest time series and trend analysis of atmospheric composition from 2002 to 2018.

We show Measurements of Pollution in the Troposphere (MOPITT) monthly average carbon monoxide (CO) as units of column average volume mixing ratio in parts per billion (ppb, blue) and Moderate Resolution Imaging Spectroradiometer (MODIS) monthly average aerosol optical depth (AOD, red). Error bars represent monthly standard deviation. Vertical gray dashed lines indicate the beginning of each year. Trends are determined using the weighted least squares estimate of the slope from data anomalies, and include the standard error of the slope estimate. For CO the mean sample size, n, is 1110 observations; for AOD the mean sample size, n, is 240 observations. Full details of all n values are provided in the Source Data file.

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