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Breakdown of number of dust events in each month for the 10 IMPROVE sites.
| Sites | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ACAD1 | 7 | 6 | 7 | 5 | 9 | 7 | 7 | 7 | 5 | 4 | 8 | 6 |
| CABA1 | 6 | 5 | 8 | 6 | 5 | 6 | 8 | 3 | 3 | 9 | 6 | 7 |
| CACO1 | 4 | 7 | 11 | 8 | 5 | 5 | 3 | 7 | 3 | 7 | 6 | 6 |
| MAVI1 | 5 | 4 | 8 | 9 | 3 | 3 | 4 | 4 | 6 | 6 | 8 | 7 |
| NEYO1 | 2 | 2 | 3 | 4 | 2 | 3 | 3 | 3 | 3 | 4 | 3 | 1 |
| BRIG1 | 6 | 3 | 5 | 8 | 8 | 7 | 6 | 6 | 2 | 5 | 7 | 9 |
| SWAN1 | 6 | 4 | 4 | 5 | 5 | 6 | 6 | 5 | 3 | 6 | 3 | 4 |
| ROMA1 | 7 | 4 | 5 | 5 | 3 | 8 | 6 | 9 | 3 | 7 | 7 | 5 |
| OKEF1 | 5 | 1 | 7 | 6 | 5 | 6 | 8 | 8 | 5 | 7 | 7 | 6 |
| EVER1 | 3 | 7 | 4 | 4 | 7 | 4 | 6 | 8 | 7 | 1 | 9 | 5 |
| Total | 51 | 43 | 62 | 60 | 52 | 55 | 57 | 60 | 40 | 56 | 64 | 56 |
