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2 votes

Slope map of Singapore

You can download Digital Elevation Model (DEM) From Earth Explorer - USGS, using this DEM Raster (cell size usually 30m) you can extract slope as a raster and then convert it into shapefile.
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1 vote

Frequently updating data for Singapore

Singapore offers an API for pollution levels (among 13 other real-time APIs) try it in their docs page: https://data.gov.sg/dataset/psi or with curl curl -X GET "https://api.data.gov.sg/v1/...
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