PSI Conversion Tables and How to Calculate the PSI (24h, 3h, and 1h)
 Share
The version of the browser you are using is no longer supported. Please upgrade to a supported browser.Dismiss

View only
 
ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAE
1
ECON COW is a new YouTube channel that focuses on economics. Please check it out and let me know how you think I can improve my videos!
2
PSI Conversion Tables
3
4
This table says, for example, that if the PM2.5 reading is exactly 10 μg/m³, then the PM2.5 PSI is ≈ 41.7 (which the NEA will round off to 42 in its published figure).
5
Scroll to the right (→) for an explanation of how these conversions are done.
6
PM2.5 (μg/m³)
PM2.5 PSI
PM10 (μg/m³)
PM10 PSISO₂ (μg/m³)SO₂ PSICO (mg/m³)CO PSIO₃ (μg/m³)O₃ PSINO₂ (μg/m³)NO₂ PSI
7
00.000.000.000.000.00 to 1129
The NO₂ PSI is not reported if the NO₂ reading is less than 1130 μg/m³. This makes no sense to me and I can't find no explanation on the NEA website.
8
14.211.053.10.11.020.81130200.0
9
28.322.0106.30.22.041.71135200.4
10
312.533.0159.40.33.062.51140200.9Breakpoints
11
416.744.02012.50.44.083.41145201.3PSIPM2.5PM10SO₂ COO₃ NO₂
12
520.855.02515.60.55.0104.21150201.8501250805118
13
625.066.03018.80.66.0125.11155202.21005515036510157
14
729.277.03521.90.77.0145.91160202.7200150350800172351130
15
833.388.04025.00.88.0166.81165203.13002504201600347852260
16
937.599.04528.10.99.0187.61170203.54003505002100469803000
17
1041.71010.05031.3110.0208.51175204.0500500600262057.511803750
18
1145.81111.05534.41.111.0229.31180204.4
19
1250.01212.06037.51.212.02410.21185204.9
20
1351.21313.06540.61.313.02611.01190205.3Explanation of how to convert readings to PSIs.
21
1452.31414.07043.81.414.02811.91195205.8
22
1553.51515.07546.91.515.03012.71200206.2
I'll only explain how the PM2.5-to-PSI conversion is done. The other pollutant-to-PSIs are similarly converted, excepted with different breakpoints (see table directly above).
23
1654.71616.08050.01.616.03213.61205206.6
24
1755.81717.08550.91.717.03414.41210207.1
For the PSI, the cut-off points, or breakpoints as the NEA calls them, are 0, 50, 100, 200, 300, 400, and 500 (unitless).
25
1857.01818.09051.81.818.03615.31215207.5
For PM2.5, the breakpoints are 0, 12, 55, 150, 250, 350, and 500μg/m³.
26
1958.11919.09552.61.919.03816.11220208.0
27
2059.32020.010053.5220.04016.91225208.4
The PM2.5 PSI is constructed so that the PM2.5 breakpoints correspond to the PSI breakpoints.
28
2160.52121.010554.42.121.04217.81230208.8
So for example, if the PM2.5 is 55μg/m³, then the PM2.5 PSI is 100.
29
2261.62222.011055.32.222.04418.61235209.3
As another example, if the PM2.5 is 350μg/m³, then the PM2.5 PSI is 400.
30
2362.82323.011556.12.323.04619.51240209.7
31
2464.02424.012057.02.424.04820.31245210.2
For any other PM2.5 level, the PM2.5 PSI is calculated by simple linear interpolation.
32
2565.12525.012557.92.525.05021.21250210.6
So for example, going from PM2.5 of 0μg/m³ to 12μg/m³, the PM2.5 PSI goes from 0 to 50.
33
2666.32626.013058.82.626.05222.01255211.1
So if the PM2.5 is 1μg/m³, then the PM2.5 PSI is 1 × (50/12) ≈ 4.17.
34
2767.42727.013559.62.727.05422.91260211.5
And if the PM2.5 is 2μg/m³, then the PM2.5 PSI is 2 × (50/12) ≈ 8.33.
35
2868.62828.014060.52.828.05623.71265211.9
36
2969.82929.014561.42.929.05824.61270212.4
37
3070.93030.015062.3330.06025.41275212.8
38
3172.13131.015563.23.131.06226.31280213.3
The other pollutant PSIs are similarly calculated, but with different breakpoints.
39
3273.33232.016064.03.232.06427.11285213.7
40
3374.43333.016564.93.333.06628.01290214.2
41
3475.63434.017065.83.434.06828.81295214.6
42
3576.73535.017566.73.535.07029.71300215.0
43
3677.93636.018067.53.636.07230.51305215.5
44
3779.13737.018568.43.737.07431.41310215.9
45
3880.23838.019069.33.838.07632.21315216.4
46
3981.43939.019570.23.939.07833.11320216.8
47
4082.64040.020071.1440.08033.91325217.3
48
4183.74141.020571.94.141.08234.71330217.7
49
4284.94242.021072.84.242.08435.61335218.1
50
4386.04343.021573.74.343.08636.41340218.6
51
4487.24444.022074.64.444.08837.31345219.0
52
4588.44545.022575.44.545.09038.11350219.5
53
4689.54646.023076.34.646.09239.01355219.9
54
4790.74747.023577.24.747.09439.81360220.4
55
4891.94848.024078.14.848.09640.71365220.8
56
4993.04949.024578.94.949.09841.51370221.2
57
5094.25050.025079.8550.010042.41375221.7
58
5195.35150.525580.75.151.010243.21380222.1
59
5296.55251.026081.65.252.010444.11385222.6
60
5397.75351.526582.55.353.010644.91390223.0
61
5498.85452.027083.35.454.010845.81395223.5
62
55100.05552.527584.25.555.011046.61400223.9
63
56101.15653.028085.15.656.011247.51405224.3
64
57102.15753.528586.05.757.011448.31410224.8
65
58103.25854.029086.85.858.011649.21415225.2
66
59104.25954.529587.75.959.011850.01420225.7
67
60105.36055.030088.6660.012052.61425226.1
68
61106.36155.530589.56.161.012255.11430226.5
69
62107.46256.031090.46.262.012457.71435227.0
70
63108.46356.531591.26.363.012660.31440227.4
71
64109.56457.032092.16.464.012862.81445227.9
72
65110.56557.532593.06.565.013065.41450228.3
73
66111.66658.033093.96.666.013267.91455228.8
74
67112.66758.533594.76.767.013470.51460229.2
75
68113.76859.034095.66.868.013673.11465229.6
76
69114.76959.534596.56.969.013875.61470230.1
77
70115.87060.035097.4770.014078.21475230.5
78
71116.87160.535598.27.171.014280.81480231.0
79
72117.97261.036099.17.272.014483.31485231.4
80
73118.97361.5365100.07.373.014685.91490231.9
81
74120.07462.0370101.17.474.014888.51495232.3
82
75121.17562.5375102.37.575.015091.01500232.7
83
76122.17663.0380103.47.676.015293.61505233.2
84
77123.27763.5385104.67.777.015496.21510233.6
85
78124.27864.0390105.77.878.015698.71515234.1
86
79125.37964.5395106.97.979.0158101.31520234.5
87
80126.38065.0400108.0880.0160103.81525235.0
88
81127.48165.5405109.28.181.0162106.41530235.4
89
82128.48266.0410110.38.282.0164109.01535235.8
90
83129.58366.5415111.58.383.0166111.51540236.3
91
84130.58467.0420112.68.484.0168114.11545236.7
92
85131.68567.5425113.88.585.0170116.71550237.2
93
86132.68668.0430114.98.686.0172119.21555237.6
94
87133.78768.5435116.18.787.0174121.81560238.1
95
88134.78869.0440117.28.888.0176124.41565238.5
96
89135.88969.5445118.48.989.0178126.91570238.9
97
90136.89070.0450119.5990.0180129.51575239.4
98
91137.99170.5455120.79.191.0182132.11580239.8
99
92138.99271.0460121.89.292.0184134.61585240.3
100
93140.09371.5465123.09.393.0186137.21590240.7
Loading...