I had some unspecific respiratory issues and swollen eyes in Bangkok. A Thai friend in Bangkok has allergies and said his condition improved considerably after buying an air purifier. So I bought one as well (Xiaomi, 3199 THB), but there is no clear improvement. However from the built-in humidity sensor I now know that humidity in my room ranges from 60-70% which is above the recommended level for living rooms. I guessed so before, because I have issues with mold.

You would think the air in Pattaya is better, at least wind from the sea would bring clean air. What is the average wind direction in Pattaya? You might want to try out an air purifier.