I agree he probably painted the effects of coal smoke. I think the clearest example would be in the painting series of London, Houses of Parliament. Several of them having "effect of fog" or "in the fog" in the title so that's what he was aiming for.

But the effects of his vision change can be seen in the water lilies especially around 1918.

It's true! It's actually really interesting to see the progression in how he viewed the world. Here is a PDF link for more in depth research and a study of his work.

>Monet's art focused on capturing the effects of color and light on the environment. His visual deterioration was probably accelerated by his insistence on outdoor painting. >The works of Claude Monet after 1908, when cataract is definitively and devastatingly installed, heavy predominance of yellow brown vibrant colors and also a clear and continuous process of blurred vision, with blurry, misshapen paintings.
>There is also a clear color change that occurred after the late surgical intervention, with a clear difference in color perception by the artist in both eyes, the operated right eye and the left one, which he refused to operate.
>There is no doubt about his diagnosis, nor that his work eternally portrays the visual effects of untreated cataracts in the elderly parient.

I thought it was just his eyes changing from having cataracts. It's a known fact he had cataracts. You can see the colors shift from cool tones to reds on the water lily paintings.

Maybe it's the picture, but she looks just like Mona-Lisa Saperstein. She's the WooOoOOOoorrRrsST.