The following statement from MC website, is dated 2005, on their 2007 schedule. During 2005, illness from fogging was minimal compared to 2004. However in 2006, there was apparently no effort to reduce fogging, as fogging occurred every night from August 17, 2006 through October 31, 2006 throughout the valley. Fogging related illness was at an all time high. In addition the poisons they were using were changed due to EPA action against the manufacturer. Prior to this, chemical information was available on their website. A key difference in product information is from a 3 day half-life to a 30 day half-life. Meaning the fog remains persistently toxic for at least 30 days with normal rainfall and sunlight.