Table:
0
A
B
C
D
E
F
1
Index
Ozone, Running 8 hourly mean (μg/m 3 )
Nitrogen Dioxide, Hourly mean (μg/m 3 )
Sulphur Dioxide, 15 minute mean (μg/m 3 )
PM10 Particles, 24 hour mean (μg/m 3 )
PM2.5 Particles, 24 hour mean (μg/m 3 )
2
1
0-33
0-66
0-88
0-11
0-16
3
2
34-65
67-133
89-176
12-23
17-33
4
3
66-99
134-199
177-265
24-34
34-49
5
4
100-120
200-267
266-354
35-41
50-58
6
5
121-140
268-334
355-442
42-46
59-66
7
6
141-159
335-399
443-531
47-52
67-74
8
7
160-187
400-467
530-708
53-58
75-83
9
8
188-213
468-534
709-886
59-64
84-91
10
9
214-239
535-599
887-1063
65-69
92-99

Questions and formulas:
Question: How many different index numbers are there for an ozone, running 8 hourly mean of 66-99?
Formula: ROWS(UNIQUE(FILTER(A1, B1="66-99")))
Formula2: ROWS(UNIQUE(FILTER(A2:A10, B2:B10="66-99")))
Level: medium
Question: What's the count of pm 10 particles when the pm 2.5 particles are at 59-66?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,F1="59-66"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,F2:F10="59-66"),5))
Level: medium
Question: What's the number of pm10 particles when sulphur dioxide is at 266-354?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="266-354"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,D2:D10="266-354"),5))
Level: medium
Question: What's the sulphur dioxide count when the ozone is at 121-140?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="121-140"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,B2:B10="121-140"),4))
Level: medium
Question: What's the sulphur dioxide count when the nitrogen dioxide is 468-534?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="468-534"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,C2:C10="468-534"),4))
Level: medium
Question: What's the nitrogen dioxide count where the sulphur dioxide is at 0-88?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="0-88"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F10,D2:D10="0-88"),3))
Level: medium