5 Years of Thai Deaths from PM2.5 Poisoning: Korat Has the Highest Illness Rate

PM2.5 dust causes progressive deaths among Thais, with Korat having the highest illness rate for five consecutive years. Following are Nakhon Si Thammarat, Chiang Mai, and Khon Kaen. Patients suffer from respiratory diseases, dermatitis, and conjunctivitis, with cumulative harmful effects impacting heart, vascular, and brain diseases.

PM2.5 data from a major public data institute covering statistics from 2021 to 2025 are as follows.

2021

Number of patients >> 7.79 million

2022

Number of patients >> 10.36 million

2023

Number of patients >> 11.23 million

2024

Number of patients >> 12.37 million

2025 (up to 18 Nov 2025 GMT+7)

Number of patients >> 10.23 million

PM2.5 levels and top 5 provinces with the most patients

1. Nakhon Ratchasima 417,069 people

2. Nakhon Si Thammarat 316,139 people

3. Chiang Mai 310,045 people

4. Khon Kaen 297,013 people

5. Ubon Ratchathani 288,742 people

PM2.5 patients by disease nationwide over 5 years

- Respiratory diseases 43.87 %

- Dermatitis 21.66 %

- Conjunctivitis 16.74 %

- Heart, vascular, and brain diseases 15.58 %

- Lung cancer 2.15 %