Supplementary Information
Evaluation of air quality in a megacity using statistical tools
Luciana Maria Baptista Ventura1,2, Fellipe de Oliveira Pinto2, Laiza Molezon Soares2,
Aderval S. Luna3, Adriana Gioda1*
1
Pontifical Catholic University of Rio de Janeiro (PUC-Rio), Chemistry Department,
Marquês de São Vicente Street, 225, Gávea, Rio de Janeiro-RJ, 22451-900, Brazil
2
Environmental Institute of Rio de Janeiro State (INEA), Air Quality Management
3
Rio de Janeiro State University (UERJ), Chemistry Institute
Table s1. Sampling sites with their respective sources of emissions, air basins and
geographic coordinates.
Sampling
sites
Downtown
Emission
Sources
Traffic
Administrative
Area
Downtown
Copacabana
Traffic /marine
Jacarepaguá
Air basin
Latitude
Longitude
III
22º54'26.67'' 43º11'43.13''
South
-
22°58'3.58'' 43°11'15.08''
Traffic
West
II
22°56'58.34'' 43°21'33.94''
Maracanã
Traffic
North
III
22°54'43.36''
Ramos
Industrial
Industrial/traffic/
Marine
North
III
22º50'21.59" 43º15'13.65"
West
I
22°54'4.59'' 43°43'22.88''
Santa Cruz
43º14'5.02''
Table s2. PM2.5 mean concentration and meteorological mean conditions on the
seasons in 2011.
Sites
Variables
Summer Autumn Winter Spring
PM2.5 (µg m ³)
12
11
13
8
WS (m.s-1)
0.6
1.0
1.0
1.0
Copacabana
T (°C)
29
24
22
24
RH (%)
71
77
73
74
PM2.5 (µg m ³)
17
19
19
13
-1
WS (m.s )
1.1
1
1.1
1
Downtown
T (°C)
27
23
22
23
RH (%)
68
72
68
68
PM2.5 (µg m ³)
31
35
35
27
-1
WS (m.s )
0.8
1.0
1.0
1.0
Jacarepaguá
T (°C)
26
22
21
22
RH (%)
92
87
83
85
PM2.5 (µg m ³)
15
21
17
10
WS (m.s-1)
1.2
1.0
1.0
1.0
Maracanã
T (°C)
29
24
22
25
RH (%)
73
79
77
76
PM2.5 (µg m ³)
17
18
20
12
-1
WS (m.s )
1.1
1.0
1.0
1.0
Ramos
T (°C)
33
28
25
28
RH (%)
74
82
77
79
PM2.5 (µg m ³)
9
10
8
7
-1
WS (m.s )
3
3
3
3
Santa Cruz
T (°C)
28
25
25
24
RH (%)
75
80
77
77
Table s3. Loading and Communalities.
Loading
Variables
PC1
Wind Direction
-0.290
Wind Speed
-0.211
Temperature
-0.702
Relative Humidity 0.791
PM 2.5
0.570
PC2
-0.773
0.762
0.174
0.025
0.185
Communalities
(%)
68%
63%
52%
63%
36%
(a)
(c)
(e)
(b)
(d)
(f)
Figure s1 –Wind rose of the stations: (a) Downtown, (b) Copacabana, (c) Jacarepaguá,
(d) Maracanã, (e) Ramos, (f) Santa Cruz.
(a)
(b)
(c)
(e)
(d)
(f)
Figure s2 – Box plots of meteorological variables and PM2.5 concentration normalized
of the stations (a) Downtown (b) Copacabana (c) Jacarepaguá (d) Maracanã (e) Ramos
(f) Santa Cruz. Dots and stars outside the boxes represent possible anomalous values.