AQI Conversion for Particle Pollution
Table for converting 24-Hour particle pollution concentrations in micrograms per cubic meter to the Air Quality Index (AQI)
| GOOD |
MODERATE |
UNHEALTHY for
SENS GROUPS |
UNHEALTHY |
VERY
UNHEALTHY |
ILO = 0
IHI = 50
BPLO = 0.0
BPHI = 15.4
|
ILO = 51
IHI = 100
BPLO = 15.5
BPHI = 40.4
|
ILO = 101
IHI = 150
BPLO = 40.5
BPHI = 65.4
|
ILO = 151
IHI = 200
BPLO = 65.5
BPHI = 150.4
|
ILO = 151
IHI = 200
BPLO = 65.5
BPHI = 150.4
|
PM Conc.
|
AQI |
|
PM Conc.
|
AQI |
|
PM Conc.
|
AQI |
|
PM Conc.
|
AQI |
|
PM Conc.
|
AQI |
| 0.4 |
1 |
15.5 |
51 |
35.5 |
101 |
55.5 |
151 |
140.5 |
201 |
| 0.6 |
2 |
15.9 |
52 |
35.9 |
102 |
57.2 |
152 |
141.5 |
202 |
| 1.0 |
3 |
16.3 |
53 |
36.3 |
103 |
58.9 |
153 |
142.5 |
204 |
| 1.2 |
4 |
16.7 |
54 |
36.7 |
104 |
60.6 |
154 |
143.5 |
205 |
| 1.6 |
5 |
17.1 |
55 |
37.1 |
105 |
62.3 |
155 |
144.5 |
207 |
| 2.0 |
6 |
17.5 |
56 |
37.5 |
106 |
64.0 |
156 |
145.5 |
208 |
| 2.2 |
7 |
17.9 |
57 |
37.9 |
107 |
65.7 |
157 |
146.5 |
209 |
| 2.6 |
8 |
18.3 |
58 |
38.3 |
108 |
67.4 |
158 |
147.5 |
211 |
| 2.8 |
9 |
18.7 |
59 |
38.7 |
109 |
69.1 |
159 |
148.5 |
212 |
| 3.2 |
10 |
19.1 |
60 |
39.1 |
110 |
70.8 |
160 |
149.5 |
214 |
| 3.4 |
11 |
19.5 |
61 |
39.5 |
111 |
72.5 |
161 |
150.5 |
215 |
| 3.8 |
12 |
19.9 |
62 |
39.9 |
112 |
74.2 |
162 |
151.5 |
217 |
| 4.0 |
13 |
20.3 |
63 |
40.3 |
113 |
75.9 |
163 |
152.5 |
218 |
| 4.4 |
14 |
20.7 |
64 |
40.7 |
114 |
77.6 |
164 |
153.5 |
219 |
| 4.6 |
15 |
21.1 |
65 |
41.1 |
115 |
79.3 |
165 |
154.5 |
221 |
| 5.0 |
16 |
21.5 |
66 |
41.5 |
116 |
81.0 |
166 |
155.5 |
222 |
| 5.2 |
17 |
22.2 |
67 |
41.9 |
117 |
82.7 |
167 |
156.5 |
224 |
| 5.6 |
18 |
22.6 |
68 |
42.3 |
118 |
84.4 |
168 |
157.5 |
225 |
| 6.0 |
19 |
23.0 |
69 |
42.7 |
119 |
86.1 |
169 |
158.5 |
226 |
| 6.2 |
20 |
23.4 |
70 |
43.1 |
120 |
87.8 |
170 |
159.5 |
228 |
| 6.6 |
21 |
23.8 |
71 |
43.5 |
121 |
89.5 |
171 |
160.5 |
229 |
| 6.8 |
22 |
24.2 |
72 |
43.9 |
122 |
91.2 |
172 |
161.5 |
231 |
| 7.2 |
23 |
24.6 |
73 |
44.3 |
123 |
92.9 |
173 |
162.5 |
232 |
| 7.4 |
24 |
25.0 |
74 |
44.7 |
124 |
94.6 |
174 |
163.5 |
234 |
| 7.8 |
25 |
25.4 |
75 |
45.1 |
125 |
96.3 |
175 |
164.5 |
235 |
| 8.0 |
26 |
25.8 |
76 |
45.5 |
126 |
99.6 |
176 |
|
|
| 8.4 |
27 |
26.2 |
77 |
45.9 |
127 |
101.3 |
177 |
|
|
| 8.6 |
28 |
26.6 |
78 |
46.3 |
128 |
103.0 |
178 |
|
|
| 9.0 |
29 |
27.0 |
79 |
46.7 |
129 |
104.7 |
179 |
|
|
| 9.2 |
30 |
27.4 |
80 |
47.1 |
130 |
106.4 |
180 |
|
|
| 9.6 |
31 |
27.8 |
81 |
47.5 |
131 |
108.1 |
181 |
|
|
| 10.0 |
32 |
28.2 |
82 |
47.9 |
132 |
109.8 |
182 |
|
|
| 10.2 |
33 |
28.6 |
83 |
48.3 |
133 |
111.5 |
183 |
|
|
| 10.6 |
34 |
29.0 |
84 |
48.7 |
134 |
113.2 |
184 |
|
|
| 10.8 |
35 |
29.4 |
85 |
49.4 |
135 |
114.9 |
185 |
|
|
| 11.2 |
36 |
29.8 |
86 |
49.8 |
136 |
116.6 |
186 |
|
|
| 11.4 |
37 |
30.2 |
87 |
50.2 |
137 |
118.3 |
187 |
|
|
| 11.8 |
38 |
30.6 |
88 |
50.6 |
138 |
120.0 |
188 |
|
|
| 12.0 |
39 |
31.0 |
89 |
51.0 |
139 |
121.7 |
189 |
|
|
| 12.4 |
40 |
31.4 |
90 |
51.4 |
140 |
123.4 |
190 |
|
|
| 12.6 |
41 |
31.8 |
91 |
51.8 |
141 |
125.1 |
191 |
|
|
| 13.0 |
42 |
32.2 |
92 |
52.2 |
142 |
126.8 |
192 |
|
|
| 13.2 |
43 |
32.6 |
93 |
52.6 |
143 |
128.5 |
193 |
|
|
| 13.6 |
44 |
33.0 |
94 |
53.0 |
144 |
130.2 |
194 |
|
|
| 14.0 |
45 |
33.4 |
95 |
53.4 |
145 |
131.9 |
195 |
|
|
| 14.2 |
46 |
33.8 |
96 |
53.8 |
146 |
133.6 |
196 |
|
|
| 14.6 |
47 |
34.2 |
97 |
54.2 |
147 |
135.3 |
197 |
|
|
| 14.8 |
48 |
34.6 |
98 |
54.6 |
148 |
137.0 |
198 |
|
|
| 15.2 |
49 |
35.0 |
99 |
55.0 |
149 |
138.7 |
199 |
|
|
| 15.4 |
50 |
35.4 |
100 |
55.4 |
150 |
140.4 |
200 |
|
|
| |
|
|
|
|
|
|
|
|
|
AQI Conversion Formula
| |
IHI - ILO |
|
| AQI = |
---------------- |
X (CPM - BPLO) + ILO |
| |
BPHI - BPLO |
|
AQI = Air Quality Index
ILO = Index Value at the Lower Limit of the AQI Category
IHI = Index Value at the Upper Limit of the AQI Category
BPLO = Break Point Conc. at the Lower Limit of the AQI Category
BPHI = Break Point Conc. at the Upper Limit of the AQI Category
CPM = 24-Hour Particle Pollution Concentration
