Air quality in the northern region reached unhealthy levels on April 17 morning. — VNA/VNS
HANOI (Xinhua): The northern region of Vietnam continued to experience poor air quality as of Tuesday (April 18) morning, with private air quality network PAM Air declaring the conditions as "unhealthy" and "very unhealthy."
Dozens of air monitoring stations in some northern localities, including Hanoi city, Hung Yen and Thai Nguyen provinces, reported the Air Quality Index (AQI) as red (AQI 151-200, "unhealthy").
