Regional Haze Request for Proposals Released. A request for proposals for the second round of regional haze SIP development work was distributed to a potential bidder list and posted on this web site under "RFPs" on December 21, 2017. A Q&A document was subsequently posted to the RFP page as well. The Q&A document answers a series of questions received from potential bidders that may be relevant to all bidders. The deadline for proposals was close of business Friday, January 26, 2018. More information on the forthcoming regional haze work will be announced at the conclusion of the contractor selection process.