Traditional Culture Encyclopedia - Weather inquiry - On April 20 this year, there was dusty weather in Lanzhou. The environmental monitoring center reports that the air pollution index is 1 17 ~ 125, and the primary pollutant is inhalability.

On April 20 this year, there was dusty weather in Lanzhou. The environmental monitoring center reports that the air pollution index is 1 17 ~ 125, and the primary pollutant is inhalability.

According to the air pollution index table, when the air pollution index is in the range of 100 ~ 200, the air quality is slightly polluted; Information provided according to the topic: On April 20th, the air pollution index in Lanzhou was 1 17 ~ 125, and the primary pollutant was inhalable particulate matter. According to this, it can be judged that the air quality on that day is slightly polluted.

So choose C.