Air Pollution in London

In 19 52 comes the fog, that's part of my book. And a the fog has shut down the whole city. So essentially, there's so much air pollution in london because it's the most populated city in the world. For five days, record breaking air pollution was trapped in that city. All of public transit shut down. Everybody called out sick. But ethel is getting worse and worse. If she is upset, she has really batarthritus as she ages. She's in her fifties when this happens.