Table 2.

Variations in PM2.5 and PM10 when outside was good (μg/m³).

	Outside		Closed system		Screen door system		Open system
	PM2.5	PM10	PM2.5	PM10	PM2.5	PM10	PM2.5	PM10
Before train entered	62	68	102	103	81	91	56	62
After train left			143	153	104	126	56	68
Percentage increase			29%	33%	22%	28%	0%	9%