Assigned months & NO$_2$ & -1.868 (0.519) & [-2.886, -0.850] & 0.530 (0.864) & [-1.164, 2.223] \\
 & CO & -7.128 (6.315) & [-19.506, 5.250] & 14.481 (7.289) & [0.194, 28.767] \\
 & SO$_2$ & -0.084 (0.082) & [-0.246, 0.077] & 0.001 (0.086) & [-0.167, 0.170] \\
 & O$_3$ & 0.563 (0.367) & [-0.156, 1.283] & -0.254 (0.858) & [-1.934, 1.427] \\
 & PM$_{10}$ & -0.108 (0.778) & [-1.632, 1.417] & 0.159 (0.847) & [-1.501, 1.819] \\
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Phase 2: Jan. 2018 & NO$_2$ & -1.840 (0.502) & [-2.824, -0.856] & 0.650 (0.782) & [-0.883, 2.183] \\
 & CO & -10.333 (6.287) & [-22.657, 1.990] & 5.000 (9.983) & [-14.567, 24.566] \\
 & SO$_2$ & -0.075 (0.081) & [-0.234, 0.084] & 0.028 (0.079) & [-0.128, 0.183] \\
 & O$_3$ & 0.464 (0.363) & [-0.247, 1.176] & -0.583 (0.854) & [-2.258, 1.091] \\
 & PM$_{10}$ & -0.445 (0.832) & [-2.077, 1.186] & -0.809 (0.870) & [-2.514, 0.896] \\
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Phase 3: July 2020 & NO$_2$ & -1.852 (0.527) & [-2.884, -0.819] & 0.606 (0.880) & [-1.119, 2.330] \\
 & CO & -7.449 (6.357) & [-19.909, 5.011] & 13.725 (6.916) & [0.170, 27.280] \\
 & SO$_2$ & -0.089 (0.083) & [-0.252, 0.074] & -0.011 (0.086) & [-0.180, 0.157] \\
 & O$_3$ & 0.489 (0.380) & [-0.256, 1.235] & -0.483 (0.903) & [-2.252, 1.286] \\
 & PM$_{10}$ & -0.127 (0.787) & [-1.670, 1.417] & 0.061 (0.852) & [-1.609, 1.731] \\
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Phase 3: Dec. 2020 & NO$_2$ & -1.844 (0.531) & [-2.884, -0.804] & 0.654 (0.881) & [-1.072, 2.380] \\
 & CO & -8.242 (6.303) & [-20.596, 4.112] & 11.793 (6.471) & [-0.891, 24.477] \\
 & SO$_2$ & -0.094 (0.084) & [-0.258, 0.071] & -0.026 (0.087) & [-0.196, 0.143] \\
 & O$_3$ & 0.513 (0.377) & [-0.226, 1.252] & -0.429 (0.874) & [-2.142, 1.283] \\
 & PM$_{10}$ & 0.027 (0.822) & [-1.584, 1.639] & 0.425 (0.924) & [-1.386, 2.237] \\