Here is some data
1) Measure of high percentage of exposure of population to poor air quality (number of days of poor air quality exposure times number of people in that area)
Pollution Locator: Smog and Particulates: Rank States by Health Risks
1. CALIFORNIA ......... 6,683,168,463
2. TEXAS ............... 1,135,690,880
3. ARIZONA ............ 172,843,464
4. OHIO ................. 104,835,921
5. ILLINOIS ............. 98,113,026
6. PENNSYLVANIA ...... 95,863,748
7. MICHIGAN ............. 95,400,215
8. NEW YORK ............ 82,756,858
9. NEVADA ............... 58,854,115
10. CONNECTICUT ...... 54,662,367
11. NEW JERSEY ........ 42,277,536
12. MISSOURI ............. 39,849,003
13. NORTH CAROLINA .... 36,179,857
14. INDIANA ............... 33,920,402
15. MARYLAND ............ 30,585,524
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43. MINNESOTA ................ 420,687
44. NEW HAMPSHIRE ......... 394,663
45. IDAHO ........................ 151,508
46. SOUTH DAKOTA ............ 91,881
47. IOWA ......................... 7,777
2) Added cancer risk due to air pollutents (the numbers below are risk per million. the clean air act goal is a 1 in 1 million risk factor so the number for NY is 1900 x larger than the goal)
1. NEW YORK .................... 1900
2. NEW JERSEY .................. 1400
3. DISTRICT OF COLUMBIA ... 1100
4. CALIFORNIA .................... 890
5. MASSACHUSETTS ............ 890
6. MARYLAND ..................... 870
7. DELAWARE ..................... 860
8. PENNSYLVANIA ............... 860
9. CONNECTICUT ................ 850
10. ILLINOIS ...................... 800
11. OHIO .......................... 730
12. INDIANA ...................... 720
13. RHODE ISLAND ............... 670
14. MINNESOTA ................. 660
15. GEORGIA ..................... 650
...
45. NEW MEXICO .................. 230
46. NORTH DAKOTA ............... 200
47. SOUTH DAKOTA ............... 190
48. MONTANA ....................... 180
49. WYOMING ...................... 140
3) Table of state cancer rates per 100,000 (attached)
Cancer – United States Cancer Statistics (USCS) Data – 2005 Selected Cancers Ranked by State (http://apps.nccd.cdc.gov/uscs/Table.aspx?Group=4fb&Year=2005&Display=n - broken link)
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What is surprising is CA is low on the state cancer rate percentages, and NY is lower down as well. Of course these are for the whole state. Regionally the cities are probably much worse. When looking at the first links I provided sorted by county, many NY counties including nassau are rated in the top 25 for added cancer risk due to air quality.