SMOG (Simple Measure of Gobbledygook) is a readability formula that estimates the years of education needed to understand a piece of writing. SMOG is widely used, particularly for checking health messages . The precise SMOG formula yields an outstandingly high 0.985 correlation with the grades of readers who had 100% comprehension of test materials. SMOG was published by G. Harry McLaughlin in 1969(External Link) as a more accurate and more easily calculated substitute for the Gunning-Fog Inde… (More on Smog)