Which season is the most serious for ozone pollution?

Summer is the season when ozone pollution is most serious.

From the perspective of seasonal changes, ozone pollution in summer and autumn is significantly stronger than that in winter and spring. The seasonal variation pattern of ozone pollution is very stable, but the absolute concentration of ozone pollution fluctuates every year. Especially when significant results have been achieved in reducing pollutant emissions, ozone pollution has become more serious.

In general, weather conditions play an important decisive role in the formation of ozone pollution. Ozone pollution is the most serious on sunny days, followed by cloudy days, and the ozone pollution is the lightest on rainy days. Meteorological factors such as relative temperature, wind direction and wind speed also affect the level of ozone pollution. Ozone pollution is prone to occur when the relative humidity is low and the wind speed is low.

In summer and autumn, ozone pollution is nationwide, and the better the lighting conditions are at the monitoring points, the more serious the ozone pollution is. Even at the Nanyue Hengshan background station, a significant increase in ozone in the afternoon can be observed, and the diurnal variation trend of its concentration is basically the same as that in urban areas.

Pollution Control

In response to the increasingly prominent ozone pollution, the new "Ambient Air Quality Standard" (GB3095-2012) implemented in our country has added ozone (03) monitoring items. The new national standard for ozone control is that the daily average 8-hour concentration of ozone is 100 micrograms/cubic meter for level one and 160 micrograms/cubic meter for level two. Incorporating standards into monitoring is the first step in the prevention and control of ozone pollution.

Reduce sources and control precursor emissions. Ozone is a typical secondary pollutant, and controlling the emission of its precursors is the key to governance. The precursors of ozone are mainly nitrogen oxides and volatile organic pollutants, and these two pollutants are also the precursors of secondary fine particles. Therefore, effectively controlling the emissions of these two precursors is not only important for controlling ozone pollution, but also for preventing and controlling PM2.5.

Reference for the above content: Baidu Encyclopedia-Ozone Pollution