Twelve-Year Trends of PM₁₀ and Visibility in the Hefei Metropolitan Area of China

Figure 7

Effects of meteorological factors on PM₁₀ concentration and visibility in Hefei during 2001–2012: (a) air temperature, (b) wind speed, (c) wind direction, (d) precipitation, and (e) relative humidity.

(a)

(b)

(c)

(d)

(e)