Environmental Association of Burning Agricultural Biomass in the Indus River Basin.

As a complementary analysis, assuming that smog is a region‐wide phenomenon and considering that PM 2.5 concentration remains above the threshold for 95% of the days, it is plausible to expect an increasing trend in PM 2.5 concentration for all months in a year.

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Kendall‐Tau analysis (Figure 1 (b)) shows that OLR has a decreasing trend in the last 15 years, except for September, which has statistically insignificant positive Kendall‐tau value.

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Since the long‐term time series suggest a positive trend in all the variables of interest, therefore, this an argument to reason that biomass burning is perhaps not entirely attributable to smog episodes in the region.

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