OPINION
The issue to be decided is whether a pollution exclusion clause in a commercial general liability insurance policy precludes coverage for injuries allegedly caused by the ingestion and/or inhalation of lead-based paint.
*101 For approximately live and one-half years between 1988 and 1993, Steven Brown (“Steven”), a minor, resided in a rental property owned by Clifford and Barbara Steely (the “Steelys”). Thereafter, Steven resided for two years in a rental property owned by Jack and Shirley Yeager (the “Yeag-ers”). In 1996, Steven’s mother, Ethel Brown, commenced an action on his behalf against the Steelys and the Yeagers, alleging negligence, breach of implied warranty of habitability, and misrepresentation. The gravamen of the complaint was that, as a result of having ingested and inhaled lead-based paint, which had been present on the interior surfaces of the residences, Steven had sustained serious injury in the form of lead poisoning and consequent neurodevelopmental delay.
For virtually the entire period of Steven’s residence on their premises, the Steelys were insured under successive commercial general liability (“CGL”) policies issued by Lititz Mutual Insurance Company (“Lititz”). When the Steelys notified Lititz of the lawsuit, the insurer notified them of its intention to defend pursuant to a reservation of rights. 1 Lititz then commenced a declaratory judgment action, seeking a determination that coverage of claims arising from residential lead paint poisoning was precluded by the policy’s “pollution exclusion.” 2 This provision excluded coverage for:
bodily injury or property damage arising out of the actual, alleged or threatened discharge, dispersal, release or escape of pollutants:
(a) at or from premises owned, rented or occupied by the named insured!.]
The policy provided further that
[p]ollutants means any solid, liquid, gaseous or thermal irritant or contaminant, including smoke, vapor, soot, fumes, *102 acids, alkalis, chemicals and waste. Waste includes materials to be recycled, reconditioned or reclaimed.
Lititz filed a motion for summary judgment, which the trial court denied, finding that both the definition of pollutants and the prescribed methods of transmission were ambiguous when applied to the facts of the case. Since lead paint was not listed among or closely related to the examples of pollutants offered by the policy, the trial court reasoned, it was possible that the exclusion was not meant to, and did not, apply to residential lead paint poisoning claims. As for the methods of transmission, the trial court noted that numerous jurisdictions had determined that terms such as “discharge” and “dispersal” were terms of art intended to denote environmental pollution. In the court’s view, that interpretation of the terms was entitled to as much weight as any other, and rendered the terms ambiguous with respect to residential pollution. Finally, the court noted, as a supporting although not decisive factor, the divided state of the law among other jurisdictions on this issue. Having concluded that the exclusion was ambiguous, the court, as required,
see Standard Venetian Blind Co. v. American Empire Ins. Co.,
The Steelys then filed their own motion for summary judgment, and were subsequently joined in that motion by the Yeagers and Steven Brown (collectively, “Appellants”). Attached to Steven Brown’s joinder were the affidavits of Ellen K. Silbergeld, Ph.D., a toxicologist; James Shockley, a paint expert; and James E. Girard, Ph.D., a chemist.' 4 The experts’ *103 affidavits, which were largely consistent with each other, made the following points: The lead that is contained in lead-based paint is never discharged or released from the paint into the atmosphere. Instead, the paint, applied to the interior surfaces of a building, deteriorates over time, and through this process of surface degradation, small fragments, chips, and microscopic particles of the paint become available for inhalation or ingestion. Lead-based paint is the principal cause of childhood lead poisoning in the United States today, but it is paint, not lead in pure elemental form, that is being inhaled or ingested.
Following oral argument, and for the reasons cited in its previous decision denying Lititz’s motion for summary judgment, the trial court granted Appellants’ motion for summary judgment to the extent of finding that Lititz had a duty to defend the Steelys. Explaining that resolution of the question of Lititz’s duty to indemnify would be premature, the court dismissed without prejudice the parties’ request for a raling on that issue. Both parties appealed to the Superior Court.
The Superior Court reversed, citing as controlling precedent our recent decision in
Madison Constr. Co. v. Harleysville Mut. Ins. Co.,
Applying this analytical framework,
Madison
considered first whether the policy’s definition of “pollutant” applied unambiguously to the product at issue. This question was answered affirmatively on the basis of the record: a manufacturer’s report referred to the irritating effects of Euco Floor Coat and noted that its constituents included chemicals known 'to be toxic.
See id.
at 606-08,
*105
Finally, this Court considered but rejected Madison’s claim that the injured party’s complaint alleged acts of negligence that did not “arise out of” the use of Euco Floor Coat. All of the plaintiffs claims of negligence, we reasoned, rested upon the fundamental averment that, while attempting to set up an exhaust fan to dissipate the fumes emanating from the curing agent, the plaintiff was suddenly overcome by those fumes.
See id.
at 611,
In applying Madison’s reasoning to the present case, the Superior Court concluded that the trial court had erred in finding that Lititz had an obligation to defend the Steelys. First, the Superior Court rejected the argument of Appellants (there, the appellees) that the exclusion was ambiguous because, if applied as written, it would render every substance in existence a pollutant.
See id.
Under
Madison,
the Superior Court explained, it was necessary to focus on the specific product at issue, and, given the abundance of information detailing the harmful effects of lead-based paint, the exclusion’s definition of pollutants clearly and unambiguously applied to that substance.
See id.
at 610-11,
Next, the Superior Court considered whether the exclusion’s requirement that the alleged injury arise out of the “actual, alleged or threatened discharge, dispersal, release or escape of pollutants” was similarly unambiguous given the facts of the case. It was unambiguous, the Superior Court concluded, because this Court had determined in
Madison
that the language of the exclusion, listing as it did numerous similar terms such as “discharge” and “dispersal,” encompassed “all types and degrees of movement.”
Id.
at 612,
*107
Turning first to the question whether lead-based paint is a pollutant within the meaning of the exclusion, it is apparent that, as in
Madison,
this is the simpler of the two policy terms to construe. Among the abundant information in support of an affirmative finding, the Superior Court cited the following: the affidavits of Dr. Silbergeld, Dr. Girard, and Mr. Shockley, all of which recognized exposure to lead-based paint as a cause of lead poisoning; the Residential Lead Based Paint Hazard Reduction Act of 1992, which labels exposure to lead-contaminated paint and dust a “hazard”; the Clean Air Act, which identifies lead as a pollutant in the context of ambient air quality; and the fact that the use of lead in residential paint was banned in 1978. In
St. Leger v. American Fire and Cas. Ins. Co.,
Next, we consider whether the exclusion’s requirement of a “discharge, dispersal, release or escape” of pollutants is also, -with reference to the process by which lead-based paint becomes available for ingestion and inhalation, unambiguous. In determining that it is, the Superior Court read the exclusionary language as encompassing all types and degrees of movement.
Steely,
On this point, the language used to describe the movement of lead-based paint is instructive. Dr. Silbergeld stated that lead-based paint deteriorates and degrades (slowly or rapidly, depending upon condition and use), and that the painted surface sheds microscopic dust through the process of exfoliation. According to Dr. Silbergeld, this process of surface degradation occurs continuously at a slow rate. Dr. Girard stated that lead-based paint abrades and that it “chips, peels, chalks, or otherwise breaks down into dust.” Mr. Shockley explained that lead-based paint deteriorates or abrades, producing paint dust, chips, and flakes. Following the experts’ lead, the Superior Court concluded that lead-based paint “over time exfoliated, abraded, flaked, deteriorated or otherwise
*109
moved off of the walls.... ”
Steely,
Common to all of these descriptions is the implication that the process by which lead-based paint becomes available for human ingestion/inhalation does not, in the usual case, occur quickly. Rather, the process of surface degradation occurs continually, but at a slow rate.
See Sphere Drake,
This, in our view, is the natural, plain, and ordinary meaning of the exclusionary language as it applies (or, more precisely, does not apply) to the dissemination of lead-based paint in a residential setting. One would not ordinarily describe the continual, imperceptible, and inevitable deterioration of paint that has been applied to the interior surface of a residence as a discharge (“a flowing or issuing out”), a release (“the act or an instance of liberating or freeing”), or an escape (“an act or instance of escaping”).
See Madison,
The order of the Superior Court is reversed.
Notes
. The Superior Court's statement that Lititz "refused to defend,”
see Lititz Mut. Ins. Co. v. Steely,
. Although the Yeagers were not insured by Lititz, Lititz named them as defendants, along with the Steelys and Steven Brown, to comply with the requirement of the Declaratory Judgment Act that all persons be made parties whose interest would be affected by the declaration sought. See 42 Pa.C.S. § 7540(a). The Yeagers have filed a brief in support of the Steelys in this appeal.
. Pursuant to Section 702(b) of the Judicial Code, 42 Pa.C.S. § 702(b), and Pennsylvania Rule of Appellate Procedure 1311, the trial court certified that its order involved a controlling question of law as to which there was a substantial ground for difference of opinion. Lititz’s subsequent petition for permission to appeal from the order was denied by the Superior Court.
. Although the three affidavits had been prepared in the course of an unrelated federal lawsuit, Nautilus Ins. Co. v. Gornish, C.A. No. 95-4531 (E.D.Pa.), counsel for Steven Brown had served them on Lititz during discovery and had assured Lititz that the three experts would testify in accordance with their affidavits if the case went to trial.
. In pertinent part, the exclusions defined “pollutants” identically, but differed in the terms used to describe the actions that will trigger the exclusion. The Lititz policy refers to the actual, alleged, or threatened "discharge, dispersal, release or escape" of pollutants; the Harleysville policy used those terms and, in addition, "seepage” and “migration.”
. Mr. Justice Gappy dissented, expressing agreement with the substantial number of jurisdictions that restrict the exclusion's application to the hazards traditionally associated with environmental pollution.
See Madison,
. Judge Johnson dissented, reasoning that the pollution exclusion clause was not implicated because the underlying claims did not "arise out of” the discharge, dispersal, release, or escape of pollutants.
See Steely,
. It appears that, of those jurisdictions that have decided the issue, a majority have found that the pollution exclusion clause does not bar coverage.
See Byrd v. Blumenreich,
. See generally Michael B. Sena, Sorting Out the Complexities of Lead-Paint Poisoning Cases, 4 J. Affordable Housing & Community Dev L. 169 (Spring 1995) (describing the problem of lead poisoning in children as longstanding and well recognized); Affidavit of Ellen K. Silbergeld, Ph.D. (explaining that exposure to lead-based paint occurs not only through ingestion of the paint, but through "inhalation of household dust contaminated with small particles of [such] paint”); Affidavit of James Shockley (noling lhat the foremost, cause of childhood lead poisoning is “lead-based paint and the accompanying contaminated dust and soil found in older houses”).
.
But see Lefrak,
. We recognize that the line between plain meaning and untempered literalism is a difficult one to draw, and that, as pertains to the absolute pollution exclusion clause, it must be guided by the decisional law as it develops against the context of individual facts. That the issue of coverage should turn upon such distinctions may well prove frustrating for the insurers who draft the policy, the consumers who purchase it, . and the jurists who are required to interpret it. It merits repeating, therefore, that, of those three, it is the drafters of the policy who are in the best position to introduce greater clarity into the process, as, for .example, by including in their policies an explicit exclusion for lead-paint poisoning.
See, e.g., Sullins v. Allstate Ins. Co.,
. Subsequent to the grant of allocatur in the present case, this Court was required to address yet another pollution exclusion clause, this one excluding coverage for all but "sudden and accidental" releases of pollutants.
See Sunbeam Corp. v. Liberty Mut. Ins. Co.,
