Vietnam teacher apologizes after igniting smear campaign against AirVisual
'I regret that my negative comments about AirVisual has affected and obstructed the app’s operations in Vietnam'
'I regret that my negative comments about AirVisual has affected and obstructed the app’s operations in Vietnam'
AirVisual has been accused of manipulating its data in order to sell air purifiers
AirVisual’s data have been frequently cited by Vietnamese news outlets in recent weeks as air quality in Vietnam’s two largest cities has been on a serious decline since September