Macao recorded 73 days where the pH value of rainwater was lower than 5.6 (classified as acid rain) in 2012, according to data from the city's Statistics and Census Service.
In 2012, Macao's mean air temperature (22.3) registered a 0.4 rise year on year. Precipitation totaled 1,556 millimetres, up by 14.1 percent year on year. There were 73 days where the pH value of rainwater was lower than 5.6 (classified as acid rain).
Total land area of Macao measured 29.9 square kilometers at the end of 2012 and the population density stood at 19,000 people per square kilometer, the figures indicated.
Meanwhile, total lane length of public roads was 417.4 kilometers, and the motor vehicle density was 526 vehicles per kilometer.
As for air quality, observation results of Macao's northern district monitoring stations revealed that the air quality level was classified as good for 251 days in 2012, down notably by 43 days from a year earlier.
The figures also indicated that the quality of potable water from the distribution network and water treatment plants of Macao conformed to the standard in 2012.