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The provided content is insufficient for a factual news brief. The RSS excerpt contains only a headline fragment and a generic introductory sentence with no concrete data, figures, dates, specific findings, or verifiable details about the ambulance demand during the June 2026 heatwave. The article body is not included, making it impossible to extract facts, attribution sources, or substantive information required for an accurate 150-250 word summary. Without access to the full article text containing specific ambulance call statistics, affected services, heat records, or health impact data, writing a brief would require invention of facts prohibited by the guidelines.