Requiring the commissioner of the pollution control agency to by a certain date develop and begin implementing a plan to reduce ambient air concentrations of toxic air contaminants exceeding the health risk benchmark as of a certain date, specifying certain plan content requirements and a deadline, requiring commissioner periodic reports to the legislature on toxic air contaminant reduction; requiring the PCA and the department of health to estimate the increased medical costs likely to result from the presence of toxic air contaminants in excess of health risk benchmarks and report to the legislature by a certain date, specifying certain consultation requirements; requiring the PCA commissioner to annually inform the public about the estimated effects of climate change on the ecology of various regions of the state (greenhouse gas reports), requiring web site availability (je)