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/environment/psi" -H "accept: application/json"
or with the browser: https://api.data.gov.sg/v1/environment/psi
(not sure if any of these 14 real-time APIs are ...