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ems-frontend/ems-monitoring-system/src/constants/pollution.ts

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+/**
+ * @file Pollution related constants, aligned with backend enums.
+ */
+
+/**
+ * Represents the types of pollution, consistent with the `PollutionType` enum in the backend.
+ * This ensures that frontend displays and data submissions are aligned with backend expectations.
+ */
+export const POLLUTION_TYPES = ['PM25', 'O3', 'NO2', 'SO2', 'OTHER'] as const;
+
+/**
+ * Type definition for a single pollution type.
+ * Ensures type safety when working with pollution constants.
+ */
+export type PollutionType = typeof POLLUTION_TYPES[number];
+
+/**
+ * A map to provide human-readable names for pollution types.
+ * Useful for displaying in UI components like chart legends or labels.
+ */
+export const POLLUTION_TYPE_MAP: Record<PollutionType, string> = {
+  PM25: 'PM2.5',
+  O3: 'O₃',
+  NO2: 'NO₂',
+  SO2: 'SO₂',
+  OTHER: '其他',
+};