You realize you can't see PM 2.5 right? Larger PM 10+ will cause the views the picture shows, and is far less deadly because it is generally trapped in the lungs and later coughed up. PM 2.5 is trapped and absorbed into the body. It can be crystal clear and you are still being poisoned if PM 2.5 concentration is higher than 20. It states in the article the picture is a file photo for reference only.