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!/^\\d{4}$/.test(postcode)) {\n return new Response(`Invalid postcode: ${postcode}`, { status: 400 });\n }\n\n const { lat, lon, name } = city;\n\n // Fetch AQI data for the given location\n const response = await fetch(\n `https://air-quality-api.open-meteo.com/v1/air-quality?latitude=${lat}&longitude=${lon}&hourly=us_aqi`\n );\n const data = await response.json();\n \n // Get the latest non-null AQI value and metadata\n const aqiValues = data.hourly.us_aqi;\n const times = data.hourly.time;\n let latestAqi = null;\n let latestTime = null;\n \n for (let i = aqiValues.length - 1; i >= 0; i--) {\n if (aqiValues[i] !== null) {\n latestAqi = aqiValues[i];\n latestTime = times[i];\n break;\n }\n }\n\n // Determine AQI category and styling\n const getAQIInfo = (aqi: number | null) => {\n if (aqi === null) return {\n color: \"#6B7280\",\n gradient: [\"#1F2937\", \"#374151\"],\n category: \"Unknown\"\n };\n \n if (aqi <= 50) return {\n color: \"#10B981\",\n gradient: [\"#065F46\", 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