. 2024 Oct 24;10(21):e39726. doi: 10.1016/j.heliyon.2024.e39726

Table 3.

Regression of air pollutants with height (coefficients and Constant number (in parentheses)).

Altitude (m)	PM_2.5	PM₁₀	PM_2.5/PM₁₀	NO₂	NO_X
≤10	−2.20^ns (166.07)	−5.61^ns (170.46)	0.003^ns (0.66)	0.99^ns (52.86)	–
10–30	4.07^a (25.94)	1.91^ns (96.85)	0.01^ns (0.32)	−0.34^ns (69.57)	–
30–60	2.4^ns (13.91)	−0.87^a (96.73)	−0.0008^ns (0.72)	−0.12^ns (61.02)	–
60–100	0.85^ns (72.41)	−0.15^ns (68.58)	0.0004^ns (0.61)	−0.06^ns (57.52)	–
100–300	−0.06^a (79.16)	−0.01^ns (129.41)	0.0001^ns (0.67)	0.09^ns (41.74)	−0.23^b (89.38)
300–500	0.02^ns (40.09)	−0.002^ns (115.14)	0.0003^ns (0.68)	0.46^ns (−39.16)	–
0–500	−0.11^b (94.32)	−0.01^ns (107.29)	0.0008^b (0.49)	0.13^b (55.58)	−0.11^b (71.17)

ns: P > 0.05.

∗∗P ≤ 0.01.

P ≤ 0.05.

P ≤ 0.001.