Spatiotemporal analysis and forecasting of air quality in the greater Dhaka region and assessment of a novel particulate matter filtration unit.

The statistical approach is as follows: 4 S = ∑ i = 1 n - 1 ∑ j = i + 1 n s g n ( x j - x i ) where, where, x j and x i are the values of sequence j, i; n is the length of the time series and S g n ( x j - x i ) = + 1 i f ( x j - x i ) > 0 0 i f ( x j - x i ) > 0 - 1 i f ( x j - x i ) > 0 If S > 0, then it indicates an increasing trend and if S < 0, then it indicates a decreasing trend.

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