There's really not much value to this report. It says absolutely nothing about the actual impact to individual health. All it does is add up certain types of emissions from individual sources around the state. That total is virtually meaningless when it comes to the actual impact on health.
What the report doesn't say is that those individual sources are regulated by Ohio EPA. Also, the total is meaningless because it doesn't account for various other factors necessary to accounting for actual risk.
See the following from US EPA (FAQS about the data:
What are the limitations of the TRI data?
Users of TRI data should be aware that TRI data reflect disposal or other releases and other waste management of chemicals, not whether (or to what degree) the public has been exposed to them. Both the toxicity of a chemical and exposure considerations should be taken into account when using the data.
• TRI chemicals vary widely in toxicity and in their capacity to produce toxic effects. Some high-volume releases of less toxic chemicals may appear to be more serious than lower-volume releases of highly toxic chemicals, when just the opposite may be true.
• The potential for exposure may be greater the longer the chemical remains unchanged in the environment. Sunlight, heat, or microorganisms may or may not decompose the chemical. Smaller releases of a persistent, highly toxic chemical may create a more serious problem than larger releases of a chemical that is rapidly converted to a less toxic form.
What should I know about the different types of disposal or other releases?
The TRI Program collects data on a number of different types of disposal or other releases, as well as on certain waste management and recycling practices. For more information on the differences between these data elements, please refer to the Toxics Release Inventory (TRI) and “Factors to Consider When Using TRI Data” on the TRI Web site. Disposal or other releases of chemicals into the environment occur through a range of practices that may ultimately affect the potential for human exposure to the toxic chemicals. Most disposal or other release practices are subject to a variety of regulatory requirements designed to limit environmental harm. . . .
Also, SO2 isn't something reported as part of the TRI. So joev's link isn't really relevant.