PM2.5 refers to particulate matter that is less than 2.5 micrometers in diameter, which is about 3% the diameter of a human hair. These fine particles are produced from a variety of sources. The primary sources include combustion processes such as motor vehicles, power plants, residential wood burning, forest fires, agricultural burning, and some industrial processes. Additionally, PM2.5 can also be formed in the atmosphere from the reactions of gases such as sulfur dioxide, nitrogen oxides, and volatile organic compounds. These gases are emitted from sources like power plants, industries, and automobiles. Due to their small size, PM2.5 particles can linger in the air longer than heavier particles, leading to higher concentrations in the atmosphere, especially during periods of stagnant air. This poses significant health risks as these particles can penetrate deep into the lungs and even enter the bloodstream. Check the air quality in your area