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air quality index

  • EghtesadOnline: Air Quality Index in Tehran on Tuesday hovered around 130, above the threshold of "unhealthy for sensitive groups", which has pushed authorities to take a further drastic measure to curb the smog.

  • EghtesadOnline: In April, Tehran’s residents experienced some relief after air quality index (AQI) improved in comparison with the same month of last year, according to data from Tehran Air Quality Control Company.