NOTICE OF PROPOSED CLASS ACTION SETTLEMENT A court authorized this Notice. This is not a solicitation from a lawyer. Colin Petrus v. Koppers Inc., United States District Court for the Northern District of Illinois, Case No. 1:24-cv-06872 If you have owned or occupied any residential property located within one mile of the Koppers Facility at 3900 S. Laramie Ave, Cicero, Illinois 60804 (“the Facility”) at any time from August 6, 2019, to September 22, 2026, you may be a Settlement Class Member. Please read this Notice carefully, as it affects your legal rights. You can also visit or call: www. LSclassaction.com 1-800-536-0045 Your Legal Rights and Options in the Settlement Deadline SUBMIT A The only way to get a cash payment. Deadline to submit a Claim CLAIM FORM You must timely submit a valid Claim Form, which is Form: on or before attached. December 7, 2026 Receive no payment. Get out of this lawsuit. Retain your right to bring your own lawsuit. If you exclude yourself or “opt out” of the settlement, you will no longer be a Settlement Class Member. This means that you will not be eligible for the benefits or EXCLUDE relief in the settlement. It also means that Class Deadline to opt out: on or YOURSELF Counsel will not be representing you and there are before November 21, 2026 statutes of limitations that may bar any individual lawsuit. Write to the Court about why you do not like the Settlement Agreement. Deadline to Comment COMMENT OR You must follow the procedures outlined below. You or Object: on or before OBJECT must remain a Settlement Class Member (you cannot November 21, 2026 opt out) in order to object to the settlement. You receive no payment and remain bound by the Settlement Agreement. By doing nothing, you will not recover money from the settlement. You will also be bound by the Settlement Agreement and give up your rights to DO NOTHING bring your own lawsuit against Defendant regarding any impact of odors or emissions from the Facility on public or private property within one mile of the Facility from August 6, 2019, through the Effective Date of the Settlement Agreement, excluding medically diagnosed personal injuries. These rights and options—and the deadlines to exercise them—are explained in this Notice. The Court in charge of this case still has to decide whether to approve the settlement. Payments will be made if the Court approves the settlement and after appeals, if any, are resolved. 1. What is the purpose of this Notice? The purpose of this Notice is to inform you of (a) the existence of a class action lawsuit; (b) the proposed settlement in the class action lawsuit; and (c) your rights with respect to that settlement. Those legal rights and options include the right to opt out of the Settlement Class and the settlement. A class action lawsuit is pending in the United States District Court for the Northern District of Illinois known as Colin Petrus v. Koppers Inc., Case No. 1:24-cv-06872. United States District Court Judge Jorge L. Alonso, who is overseeing this case, authorized this Notice. You have a right to know about the class action lawsuit and proposed settlement. As a Settlement Class Member you have various options that you may exercise before the Court decides whether to approve the settlement. If the Court approves the Settlement Agreement, and after any appeals are resolved, payments will be made pursuant to the Settlement Agreement to Settlement Class Members who submit timely and valid claims. This Notice explains the lawsuit, the Settlement Agreement, your legal rights, the available benefits, who is eligible for them, and how to get them. 2. What is this lawsuit about? This lawsuit was brought by Colin Petrus (“Plaintiff”) against Koppers Inc. (“Defendant”). Plaintiff alleges that from August 6, 2019, to present, odorous emissions from Defendant’s Facility invaded residential properties and public spaces within one mile of the Facility. Defendant denies—and no judge or jury has found—any fault, liability, or damages arising out of these allegations. Plaintiff and the Settlement Class are represented in this case by Liddle Sheets P.C. (“Class Counsel”). You can read the First Amended Class Action Complaint at www.LSclassaction.com. 3. Why is there a settlement? No judge or jury has found in favor of Plaintiff or Defendant. Instead, after a settlement conference and other settlement discussions, the Parties reached a Settlement Agreement. By doing so, the Parties avoid the cost, delay, and risks associated with the lawsuit. The proposed settlement does not mean that Defendant did anything wrong or caused any damages. Plaintiff and Class Counsel believe that the settlement is in the best interest of the Settlement Class. 4. Am I part of this Settlement Class? The Settlement Class consists of all owners or occupants of any residential property located within one mile of Defendant’s Facility at any time from August 6, 2019, through September 22, 2026 who do not affirmatively exclude themselves from the settlement in the specific manner provided below. A rough map of the Class Area is included below. This map is for illustrative purposes only and does not determine whether or not you are a Settlement Class Member. 5. I’m still not sure if I am included? If you are still not sure whether you are included, you can get free help by calling 1-800-536-0045, or by writing Class Counsel at: Class Counsel Colin Petrus v. Koppers Inc., c/o Liddle Sheets P.C. 975 E. Jefferson Ave. Detroit, MI 48207 You may also visit the settlement website at: www.LSclassaction.com THE PROPOSED SETTLEMENT 6. What are the benefits of the settlement? If the settlement is approved by the Court at or after the Settlement Fairness and Final Approval Hearing described in Question 20 of this Notice, Defendant has agreed to the creation of a Settlement Fund totaling $625,000. 7. How do I get paid? To obtain payment from the Settlement Fund, you must do the following: A. Complete, sign, and date the Claim Form (which is enclosed with these materials). Keep a copy of the completed Claim Form for your records; and B. Mail the appropriate Claim Form and your supporting documentation, postmarked on or before December 7, 2026 to the following address: Attn: Koppers Inc. Claim, Liddle Sheets P.C., 975 E. Jefferson Ave., Detroit, MI 48207. The documentation that must be contained with your Claim Form can be found on the Claim Form. If you lose the Claim Form that was mailed to you, additional Claim Forms are located at www.LSclassaction.com 8. What if I don’t timely mail a completed Claim Form? If you fail to submit the Claim Form on or before December 7, 2026, you will not get paid. You will be bound by the terms of the Settlement Agreement, including the release of claims against Defendant and affiliated persons/entities, unless you affirmatively exclude yourself in the manner provided in response to Question 12 below. Sending in a Claim Form late is the same as doing nothing. 9. How are payments calculated? The amount of compensation paid to each Settlement Class Member will be dependent, in part, on the total number of valid Claim Forms submitted. Accordingly, the amount a Settlement Class Member will receive will not be known until after all Claim Forms have been submitted and assessed. Class Counsel will determine the approved claim amount for a Settlement Class Member who has submitted a valid Claim Form based upon the total number of approved Claim Forms. The claim amount for each approved Claim will be calculated by dividing the Net Settlement Funds (i.e., the balance remaining after attorneys’ fees, litigation expenses, and Service Awards have been distributed from the Settlement Fund) by the total number of addresses for which claims have been submitted. 10. When will I get paid? The date when payments will be issued cannot be determined at this time. Please be patient. On January 19, 2027, the Court will hold a hearing to decide whether or not to approve the settlement. If the Court approves the settlement, Class Counsel will begin reviewing each Claim Form submitted. Please note that there could be a delay if there is an appeal of the Court’s order approving the Settlement Agreement. 11. What am I giving up by staying in the Settlement Class? If the settlement becomes final, Settlement Class Members who do not affirmatively opt out in the specific manner described in response to Question 12 below, regardless of whether they submit a Claim Form, will release the Defendant and its affiliates from all claims, known or unknown, which the Settlement Class Members ever had, now have, or can have, arising from or related to any impact of odors or emissions from the Facility on public or private property within one mile of the Facility from August 6, 2019, through the Effective Date of the Settlement Agreement. However, this does not include any claims for medically diagnosed personal injuries. Settlement Class Members who do not affirmatively opt out in the specific manner described in response to Question 12 below shall be deemed to have waived any and all provisions, rights, and benefits conferred by any law of any state or territory of the United States, or principle of common law or foreign law, which is similar, comparable, or equivalent to California Civil Code §1542, which provides: A general release does not extend to claims that the creditor or releasing party does not know or suspect to exist in his or her favor at the time of executing the release and that, if known by him or her, would have materially affected his or her settlement with the debtor or released party. For a full definition of the claims you will release if you do not opt out of the settlement in the specific manner set forth in response to Question 12 below, refer to the Released Claims definition in Section 2(q) of the Settlement Agreement, which can be found at www.LSclassaction.com. You can also call 1-800-536-0045 with any questions. The release shall not bar claims for medically diagnosed personal injuries. OPTING OUT OF THE SETTLEMENT 12. How do I get out of this settlement? To opt out of the settlement, you must send a letter by First Class U.S. mail to Settlement Class Counsel that contains the following statement: “I WISH TO BE EXCLUDED FROM THE COLIN PETRUS V. KOPPERS INC., SETTLEMENT. I UNDERSTAND BY EXCLUDING MYSELF, I WILL NOT RECEIVE ANY MONEY FROM THE SETTLEMENT REACHED IN THIS MATTER.” You cannot opt out on the phone or by e-mail. Be sure to include your full name, the address of the Settlement Class Area property, signature, and the date. You must mail your exclusion request, postmarked on or before November 21, 2026 to: Class Counsel Colin Petrus v. Koppers Inc., c/o Liddle Sheets P.C. 975 E. Jefferson Ave. Detroit, MI 48207 If you timely submit your request to opt out, you will not get paid and you cannot object to the settlement. You will not be legally bound by the Settlement Agreement. 13. If I don’t opt out, can I bring my own lawsuit later? No. If you do not opt out in the specific manner described in response to Question 12 above and the settlement is approved, you will be unable to bring any lawsuit against Defendant or its affiliates based on any claim arising from or relating to any impact of odors or emissions from the Facility on public or private property within one mile of the Facility from August 6, 2019, through the Effective Date of the Settlement Agreement. The only exception is that nothing in this settlement or release prevents Class Members from filing claims for medically diagnosed personal injuries. For a full definition of the claims you will release if you do not opt out of the settlement in the specific manner set forth in response to Question 12 below, refer to the Released Claims definition in Section 2(q) of the Settlement Agreement, which can be found at www.LSclassaction.com. You can also call 1-800-536-0045 with any questions. The Settlement Agreement does not bar any suit based upon conduct occurring after the Effective Date of the Settlement Agreement, but it does bar future damages arising from conduct that occurred on or before the Effective Date of the Settlement Agreement. 14. If I opt out can I still get money from this settlement? No. If you opt out of the Settlement Class you won’t get any money or benefits from the settlement. THE LAWYERS REPRESENTING YOU 15. Do I have a lawyer in this lawsuit? The Court has preliminarily appointed the law firm of Liddle Sheets P.C. as qualified to serve as Class Counsel and to represent you and all Settlement Class Members in this lawsuit. You will not be charged by these lawyers for their work on the case, but they will ask the Court to award attorneys’ fees and expenses from the Settlement Fund. You may contact Class Counsel with any questions. 16. Should I get my own lawyer? You do not need to hire your own lawyer because Class Counsel is working on your behalf. But, if you want your own lawyer or wish to consult with another lawyer about this settlement, you are free to do so and may hire one at your own expense. 17. How will the lawyers be paid and will there be incentive payments? Class Counsel has not received any fees for the lawyer and professional time it has devoted to this matter, nor has it received any reimbursement for any of the out-of-pocket expenses it has incurred. Class Counsel will apply to the Court for an award of attorneys’ fees that does not exceed one-third of the Settlement Fund, and expenses that they incurred in litigating the case. In addition, Class Counsel will ask that the Court award the named Plaintiff Colin Petrus a $7,500 Service Award in recognition of his efforts on behalf of the Settlement Class. Any fees, expenses or incentive awards that Class Counsel request must be approved by the Court. Class Counsel will request that their fees and expenses and the Service Award be paid from the Settlement Fund. SUPPORTING OR OBJECTING TO THE SETTLEMENT 18. How do I tell the Court that I like or do not like the settlement? If you are a Settlement Class Member and do not opt out, you can tell the Court that you like the settlement and it should be approved, or that you object to the settlement if you do not like some part or all of it. The Court will consider all comments and objections from Settlement Class Members. To comment on or to object to the settlement, you must submit a written statement to Class Counsel at the address below, setting forth: • Your legal name, your current address, the address of the Settlement Class Area property which you owned or occupied from August 6, 2019, through September 22, 2026 and the period during which you owned or occupied it, your current contact telephone number, and your signature; • The reference “Colin Petrus v. Koppers Inc., Case No. 1:24-cv-06872”; • You may include documentary or physical evidence establishing your membership in the Settlement Class; and • A detailed statement of your objections, comments, or any supporting arguments, together with any supporting documents. In order for the Court to consider your comments or objections, you must submit them, along with any request to speak at the Fairness Hearing (See Questions 20-22), postmarked on or before November 21, 2026 to Class Counsel at the following address: Class Counsel Colin Petrus v. Koppers Inc., c/o Liddle Sheets P.C. 975 E. Jefferson Ave. Detroit, MI 48207 If you do not submit a written comment or objection to the settlement in accordance with the deadline and procedure set forth above, you will waive your right to be heard at the Fairness Hearing. 19. What is the difference between objecting and opting out? Objecting is simply telling the Court that you do not like something about the settlement. You can object only if you stay in the Settlement Class. Opting out is telling the Court that you do not want to be part of the Settlement Class. If you opt out, you have no basis to object because the settlement no longer affects you. 20. When and where will the Court decide to approve the settlement? The Court will hold a Settlement Fairness and Final Approval Hearing on January 19, 2027 at 11:00 am the United States District Court for the Northern District of Illinois Eastern Division, 219 South Dearborn Street, Chicago, Illinois, 60604. The hearing may be held by telephone or virtually if the Court so directs, in which case information regarding how Settlement Class Members may attend the hearing will be made available on the Court’s docket and on the settlement website at www.LSclassaction.com. At this hearing the Court will consider whether the settlement is fair, reasonable, and adequate. If there are objections, the Court will consider them. The Court may listen to Settlement Class Members who have asked to speak at the hearing. The Court may also decide the amount of attorney’s fees and expenses to be awarded to Class Counsel and the amount of any incentive award to Plaintiff Petrus, all of which will be paid from the Settlement Fund, along with administrative expenses approved by the Court. After the hearing, the Court will decide whether to approve the settlement. We do not know how long it will take for the Court to make its decision. 21. Do I have to attend the hearing? No. Class Counsel will answer questions the Court may have during the hearing on the Settlement Class Members’ behalf, but you are welcome to attend the hearing at your own expense. If you send an objection, you do not have to attend the hearing to discuss that objection. As long as your written objection establishes membership in the Settlement Class and is timely submitted, the Court will consider it. You may also pay your own lawyer to attend, but it is not necessary. 22. May I speak at the hearing? If you would like to speak at the Fairness Hearing about your comments or objections to the Settlement Agreement, you must add to your letter commenting or objecting to the settlement a statement that you intend to appear and speak at the hearing. An example is stating: “This is my Notice of Intention to speak at the Settlement Fairness and Final Approval Hearing in Petrus v. Koppers Inc.” If you do not submit a written comment or objection on the proposed settlement in accordance with the deadline and procedure set forth above, you will waive your right to be heard at the hearing. You cannot speak at the hearing if you opt out. If you intend to appear at the hearing through counsel, your comment must also identify all attorneys representing you who will appear at the hearing and provide the basis for your objection and what you dislike about the settlement. IF YOU DO NOTHING 23. What happens if I do nothing at all? If you do nothing, you’ll get no money from the settlement but will still be bound by the Settlement Agreement and lose your ability to sue, continue to sue, or be part of any other lawsuit against Defendant arising from or related to any impact of odors or emissions from the Facility on public or private property within one mile of the Facility from August 6, 2019, through the Effective Date of the Settlement Agreement, excluding medically diagnosed personal injuries. For a full definition of the claims you will release if you do not opt out of the settlement in the specific manner set forth in response to Question 12 above, refer to the Released Claims definition in Section 2(q) of the Settlement Agreement, which can be found at www.LSclassaction.com. You can also call 1-800-536-0045 with any questions. ADDITIONAL INFORMATION 24. Are there more details available? Visit the website at www.LSclassaction.com where you can find extra Claim Forms, information on the litigation and settlement, and documents such as the First Amended Class Action Complaint filed by Plaintiff Colin Petrus. You may also contact Class Counsel at 1-800-536-0045 or write them at: Liddle Sheets P.C. Attn: Koppers Inc Settlement 975 E. Jefferson Ave. Detroit, MI 48207 PLEASE DO NOT CALL OR WRITE TO KOPPERS OR THE CLERK OF THE COURT. NEITHER WILL ANSWER QUESTIONS CONCERNING THE LAWSUIT OR THE SETTLEMENT.