Continue your usual outdoor activities.
PM₁₀ includes both fine particles (PM₂.₅) and larger particles up to 10 micrometres across. Sources include road and construction dust, wind-blown soil, fuel burning and particles formed in the atmosphere. PM₁₀ is not the same as coarse particles alone: those are the fraction between 2.5 and 10 micrometres.
Sulfur dioxide (SO₂) is a colourless gas. Major sources include burning sulfur-containing fuels, such as coal and oil, for heating, electricity generation and industrial processes.