Mitigating landfill gas emissions: the effectiveness of HDPE covers in reducing atmospheric concentrations of H2S, NH3, and PM10

Figures & Tables

Year	Season	Count	Mean	SD	Min	Q1	Median	Q3	Max
H₂S (mg/m³)
2018	Autumn	91	1.33	1.36	0.20	0.55	0.90	1.50	9.70
	Spring	92	0.83	0.28	0.40	0.60	0.80	1.00	1.70
	Summer	92	0.67	0.28	0.30	0.48	0.60	0.80	1.50
	Winter	90	1.32	1.27	0.20	0.70	0.90	1.18	7.10
2021	Autumn	91	0.58	0.19	0.30	0.50	0.50	0.70	1.40
	Spring	92	0.64	0.19	0.20	0.50	0.60	0.80	1.10
	Summer	92	0.70	0.19	0.30	0.60	0.70	0.80	1.10
	Winter	90	0.70	0.43	0.20	0.40	0.60	0.80	2.50
NH₃ (mg/m³)
2018	Autumn	91	1.77	0.83	0.30	1.15	1.60	2.25	4.10
	Spring	92	1.46	0.69	0.30	1.00	1.30	1.80	3.60
	Summer	92	1.55	0.91	0.10	0.90	1.45	2.10	4.30
	Winter	90	1.65	0.95	0.30	0.90	1.50	2.20	4.40
2021	Autumn	91	1.71	0.59	0.70	1.30	1.50	1.90	4.30
	Spring	92	2.31	0.92	0.90	1.70	2.07	2.70	5.40
	Summer	92	1.88	0.73	0.40	1.30	1.80	2.40	3.60
	Winter	90	1.85	0.74	0.70	1.40	1.70	2.18	4.30
PM₁₀ (mg/m³)
2018	Autumn	91	20.15	7.08	8.00	14.57	19.16	24.51	40.30
	Spring	92	22.06	12.17	7.10	15.55	19.60	25.90	108.60
	Summer	92	18.40	6.13	8.16	14.01	17.64	21.68	35.80
	Winter	90	20.43	8.60	5.70	14.11	18.23	26.48	48.40
2021	Autumn	91	16.09	8.69	3.50	9.60	15.00	21.40	54.20
	Spring	92	12.05	7.60	2.50	7.05	9.95	13.85	39.20
	Summer	92	15.73	10.85	2.40	9.88	13.45	17.80	79.80
	Winter	90	17.62	14.06	3.30	8.53	14.05	22.03	83.80