Why is the weather so abnormal recently? The temperature forecast is only 35 or 36 degrees. Why has the temperature exceeded 40 degrees for several days in a row?

First of all, the prediction itself is not accurate and there will be errors. Secondly, the pollution is getting more and more serious now. There is a lot of floating dust in the sky. The previous forecast was ok, and the air pollution was not serious. Now floating dust will have an impact on the forecast, and even the forecast of rain will become inaccurate, not to mention the temperature. Floating dust will scatter light, but I really don't understand the specific principle.