| Crude rates of physician office visitsa | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Jan | Feb | Mar | Apr | May | June | July | Aug | Sept | Oct | Nov | Dec |
Air pollution-sensitive | 8.05 | 8.84 | 8.94 | 7.80 | 7.21 | 6.55 | 5.15 | 4.73 | 6.57 | 7.52 | 9.27 | 10.89 |
Air pollution-insensitive | 1.48 | 1.52 | 1.61 | 1.55 | 1.63 | 1.63 | 1.34 | 1.29 | 1.34 | 1.38 | 1.54 | 1.22 |