The proportion of PM1 within PM2.5 can be very high, as PM2.5 refers to particles with a diameter of less than or equal to 2.5 micrometers, while PM1 refers to particles with a diameter of less than or equal to 1 micrometer, meaning all PM1 particles are also part of PM2.5. Depending on the environment and source, the proportion of PM1 in PM2.5 can vary significantly.

The proportion of PM1 within PM2.5 typically ranges from 50% to 90%, influenced by several key factors, including:

• Pollution Sources: In areas with intense human activities such as industrial emissions and vehicle exhaust, the proportion of PM1 in PM2.5 tends to be higher due to the generation of finer particles.
• Climate Conditions: Humid environments facilitate the formation and accumulation of PM1 particles, potentially increasing their proportion within PM2.5 in moist climates.
• Seasonal Variations: During certain seasons, like the heating period in winter, the proportion of PM1 in PM2.5 can increase due to elevated particulate matter emissions from domestic and industrial heating.
• Geographic Location: Urban and industrial areas, with their higher human-induced pollution, typically have a higher proportion of PM1 in PM2.5 compared to rural areas.

Understanding the proportion of PM1 within PM2.5 is crucial for assessing the health risks associated with air pollution and for developing effective air quality management strategies.

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