Examining the Impact of Nitrous Acid Chemistry on Ozone and PM over the Pearl River Delta Region

Figure 5

Spatial distribution of simulated HONO through homogeneous reactions, direct emission, heterogeneous reaction, and surface photolysis formation pathway at daytime (a–d) and nighttime (e–h).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)