Fitting results of annual PM_2.5 data for 2015.

<p>Fitting results of annual PM_2.5 data for 2015.</p

Cross-validation results of PM_2.5 data for summer 2015.

<p>Cross-validation results of PM_2.5 data for summer 2015.</p

The coefficients estimated in the regression models.

<p>The coefficients estimated in the regression models.</p

Cross-validation results of annual PM_2.5 data for 2015.

<p>Cross-validation results of annual PM_2.5 data for 2015.</p

Cross-validation results of PM_2.5 data for spring 2015.

<p>Cross-validation results of PM_2.5 data for spring 2015.</p

Fitting results of PM_2.5 data for autumn 2015.

<p>Fitting results of PM_2.5 data for autumn 2015.</p

Summary of R² and error measure for fitting and cross-validation result.

<p>Summary of R² and error measure for fitting and cross-validation result.</p

Fitting results of PM_2.5 data for winter 2015.

<p>Fitting results of PM_2.5 data for winter 2015.</p

Fitting results of PM_2.5 data for spring 2015.

<p>Fitting results of PM_2.5 data for spring 2015.</p

Cross-validation results of PM_2.5 data for autumn 2015.

<p>Cross-validation results of PM_2.5 data for autumn 2015.</p