City records more days with poor-quality air

Macau has recorded several days of poor air quality levels in August and September, according to Meteorological and Geophysics Bureau data.

Information has shown the city faced three “unhealthy” days in August, 17 “unhealthy” days and four “very unhealthy” days.

Compared to the same period last year, the number of days with poor air quality was relatively higher, since the record last year was only three days. 

According to SMG, the city’s air quality is consistent with integral variations in the Pearl River Delta (PRD) region, particularly Guangdong, Hong Kong and Macau.

In recent years, the average annual concentration of inhalable particles in suspension (PM10), fine inhalable particles in suspension (PM2.5) and nitrogen dioxide (NO3), among other main pollutants, has shown a downward trend, while ozone (O3) has exhibited an upward trend, which demonstrates that photochemical pollution in the Pearl River Delta region needs to be improved.

In this regard, the governments of Guangdong, Hong Kong and Macau are carrying out a three-year study on “Photochemical O3 Pollution in the Greater Bay Area and the characterization of regional and interregional O3 displacement” (2021-2024), to study the source of ozone precursors in the Greater Bay, the causes of ozone and the characteristics of regional and interregional transmission. LV