Table:
0
A
B
C
D
E
1
Pollutant
Type
Standard
Averaging Time
Regulatory Citation
2
SO 2
Primary
0.14 ppm (365 μg / m 3 )
24-hour
40 CFR 50.4(b)
3
SO 2
Primary
0.030 ppm (80 μg/m³)
annual
40 CFR 50.4(a)
4
SO 2
Secondary
0.5 ppm (1,300 μg/m³)
3-hour
40 CFR 50.5(a)
5
PM 10
Primary and Secondary
150 μg/m³
24-hour
40 CFR 50.6(a)
6
PM 2.5
Secondary
35 μg/m³
24-hour
40 CFR 50.7(a)
7
PM 2.5
Primary
15 μg/m³
annual
40 CFR 50.7(a)
8
CO
Primary
35 ppm (40 mg /m³)
1-hour
40 CFR 50.8(a)(2)
9
CO
Primary
9 ppm (10mg/m³)
8-hour
40 CFR 50.8(a)(1)
10
O 3
Primary and Secondary
0.12 ppm (235 μg/m³)
1-hour
40 CFR 50.9(a)
11
O 3
Primary and Secondary
0.075 ppm (150 μg/m³)
8-hour
40 CFR 50.10(a)
12
NO 2
Primary and Secondary
0.053 ppm (100 μg/m³)
annual
40 CFR 50.11(a) and (b)
13
Pb
Primary and Secondary
0.15 μg/m³
Rolling 3 months
40 CFR 50.12

Questions and formulas:
Question: what is the averaging time when the regulatory citation is 40 cfr 50.4(b)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="40 cfr 50.4(b)"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,E2:E13="40 cfr 50.4(b)"),4))
Level: medium
Question: what is the regulatory citation when the standard is 15 μg/m³?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="15 μg/m³"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,C2:C13="15 μg/m³"),5))
Level: medium
Question: what is the standard when the pollutant is o 3 and averaging time is 8-hour?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(A1="o 3")*(D1="8-hour")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,(A2:A13="o 3")*(D2:D13="8-hour")),3))
Level: medium
Question: what is the polluntant when the regulatory citation is 40 cfr 50.7(a) and the type is primary?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="40 cfr 50.7(a)")*(B1="primary")),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,(E2:E13="40 cfr 50.7(a)")*(B2:B13="primary")),1))
Level: medium
Question: what is the type when the averaging time is 1-hour and the standard is 0.12 ppm (235 μg/m³)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="1-hour")*(C1="0.12 ppm (235 μg/m³)")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,(D2:D13="1-hour")*(C2:C13="0.12 ppm (235 μg/m³)")),2))
Level: medium
Question: what is the type when the regulatory citation is 40 cfr 50.9(a)?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="40 cfr 50.9(a)"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E13,E2:E13="40 cfr 50.9(a)"),2))
Level: medium