Table 3.

Annual air pollutant removal, gross carbon sequestration, and carbon storage of 790 heritage trees in Macau, 2011 through 2012, computed by genus, tree location, and geographical origin.

	Genus	No. of trees	Air pollutant removal (g/yr)							Gross carbon sequestration (kg/yr)	Carbon storage (kg)
	Genus	No. of trees	CO	O₃	NO₂	SO₂	PM_2.5	PM₁₀	Total	Gross carbon sequestration (kg/yr)	Carbon storage (kg)
	Acacia	2	199	2,653	1,600	983	5	438	5,877	79	5,747
	Aglaia	1	1	5	10	1	0	11	29	8	135
	Albizia	14	425	1,617	3,313	318	58	4,339	10,070	663	36,278
	Aleurites	10	278	1,056	2,163	208	24	1,754	5,482	480	26,441
	Aporosa	1	10	39	80	8	1	61	200	17	534
	Araucaria	1	28	107	219	21	1	70	447	16	919
	Artocarpus	6	221	1,654	1,742	523	18	1,471	5,629	211	13,703
	Averrhoa	4	145	1,090	928	404	12	1,129	3,707	180	9,254
	Bombax	21	1,025	4,966	7,301	1,558	83	7,089	22,021	986	69,295
	Bridelia	3	188	1,586	1,488	524	15	1,252	5,052	70	2,977
	Canarium	1	20	75	153	15	1	107	370	33	1,611
	Cassia	2	264	1,002	2,053	197	6	443	3,965	71	3,763
	Celtis	10	670	4,212	4,790	1,360	64	5,531	16,627	333	26,588
	Cinnamomum	44	2,073	10,759	15,285	3,066	189	15,576	46,949	1,751	154,241
	Cleistocalyx	3	163	1,355	1,293	445	13	1,098	4,367	123	8,490
	Cordia	1	34	129	264	25	3	191	646	44	2,638
	Delonix	11	568	3,286	4,456	920	47	3,685	12,962	489	33,445
	Dimocarpus	38	1,656	10,557	10,799	3,705	127	11,853	38,697	1,337	50,363
	Diospyros	1	27	103	211	20	2	150	513	27	1,166
	Dracontomelon	2	108	411	842	81	10	728	2,179	83	4,918
	Elaeocarpus	3	113	428	876	84	9	673	2,182	107	5,693
	Erythrina	8	483	3,353	2,121	1,479	33	3,966	11,435	425	30,878
	Eucalyptus	1	35	135	276	27	1	100	574	18	5,448
	Ficus	440	19,793	156,280	140,949	54,667	1,555	140,142	513,386	11,558	2,241,163
	Hibiscus	1	11	42	86	8	1	82	230	23	880
	Ilex	2	185	703	1,439	138	8	610	3,083	71	3,870
	Lagerstroemia	2	14	181	109	67	1	108	479	17	359
	Litchi	2	94	656	741	202	7	592	2,292	60	2,303
	Litsea	21	681	2,924	5,168	695	53	4,102	13,622	871	47,292
	Lophostemon	1	42	563	340	209	3	303	1,460	30	1,379
	Macaranga	1	124	471	965	93	10	773	2,436	50	3,391
	Machilus	2	162	2,165	1,305	802	14	1,248	5,696	37	6,472
	Mangifera	2	93	356	728	70	8	555	1,810	79	7,123
	Manikara	1	33	124	254	24	2	176	614	27	1,152
	Michelia	3	157	597	1,222	117	12	884	2,988	114	7,043
	Morus	4	130	1,211	1,032	412	11	911	3,706	169	7,022
	Murraya	3	32	121	247	24	3	190	616	52	1,832
	Ormosia	1	63	837	505	310	5	466	2,186	15	454
	Phyllanthus	1	16	218	132	81	1	118	566	13	350
	Pinus	3	60	228	468	45	4	274	1,078	41	2,316
	Plumeria	26	417	1,680	3,110	391	32	2,531	8,162	609	31,255
	Podocarpus	12	1,063	4,042	8,278	795	35	2,609	16,822	117	5,018
	Pterospermum	13	1,023	3,893	7,973	766	84	6,237	19,976	425	49,477
	Rhaphiolepis	4	28	369	222	137	2	206	964	18	246
	Sapindus	3	103	578	521	236	7	794	2,239	99	4,221
	Sapium	6	173	1,006	1,354	283	14	1,117	3,946	153	6,522
	Schefflera	2	14	53	109	11	1	81	269	54	2,351
	Sterculia	7	162	617	1,264	121	13	987	3,165	181	9,054
	Syzygium	38	1,386	6,406	9,613	1,861	107	9,124	28,497	1,529	100,190
	Ulmus	1	83	315	646	62	4	332	1,442	72	3,502
Location	Street tree	289	11,434	94,160	77,555	34,530	888	84,263	302,830	9,653	1,334,392
	Non-street tree	501	23,441	143,053	173,483	44,065	1,832	153,005	538,879	14,383	1,706,371
Origin	Native species	300	16,657	89,907	123,546	26,123	1,322	108,472	366,028	11,406	953,895
	Exotic species	490	18,217	147,306	127,492	52,473	1,398	128,796	475,681	12,630	2,086,869
Total		790	34,875	237,213	251,038	78,596	2,720	237,268	841,709	24,036	3,040,764