A report on the Guangdong-Hong Kong-Macao Pearl River Delta Region’s air quality in 2025 reflects the effectiveness of emission reduction measures in improving air quality across the region.

Guangdong, Hong Kong and Macau today jointly released a report on air quality in 2025 under the Guangdong-Hong Kong-Macao Pearl River Delta Regional Air Quality Monitoring Network.

The report indicates a long-term downward trend in the concentrations of various air pollutants: sulphur dioxide, nitrogen dioxide, carbon monoxide, respirable suspended particulates and fine suspended particulates.

Compared with 20 years ago, the 2025 annual average concentrations for these parameters have declined by between 23% and 86%. Among these, the concentration of fine suspended particulates dropped to 19 μg/m³, reaching a leading national level.

The Hong Kong Special Administrative Region Government has implemented various emission control measures to enhance air quality.

Moreover, the Air Pollution Control (Amendment) Ordinance 2025 – which came into effect in April last year – updated a number of air quality objectives, with seven out of 15 set at the most stringent levels of the World Health Organization Global Air Quality Guidelines.

The Hong Kong SAR Government is also committed to phasing out approximately 40,000 Euro IV diesel commercial vehicles by the end of 2027. As of August, more than 33,700 such vehicles had been phased out.

To support the green transformation of vehicles to achieve zero vehicular emissions before 2050, Hong Kong will cease new registrations of fuel-propelled private cars, including hybrids, in 2035 or earlier, and will introduce 700 electric buses and 3,000 electric taxis by the end of 2027.

As of the end of September, there were about 185,600 electric vehicles (EVs) in Hong Kong, including about 180,300 electric private cars - approximately six times the 2021 figure and accounting for about 27.6% of all private cars there. 

The number of parking spaces with charging facilities in Hong Kong exceeds 170,000, including around 18,090 public chargers. The overall charging infrastructure is sufficient to support more than 290,000 EVs.