The media frenzy about the PM2.5 issue is new this year, but the air quality problem itself has been around for a while. This graph from a Kumanichi article on the issue shows similar levels in the past few years.
The media frenzy about the PM2.5 issue is new this year, but the air quality problem itself has been around for a while. This graph from a Kumanichi article on the issue shows similar levels in the past few years.