Information from the Statistics and Census Service indicated that total land area of Macao measured 28.6 km2 at the end of 2006 and the population density reached 17,952 persons per km2. Total lane length of public roads was 383.6 km, density of motor vehicles was 425 vehicles per km. At the end of 2006, the number of trees on the roadside in Macao totalled 12,612, up by 18.7% over 2005, while the number of trees in the replantation area of the Islands increased slightly by 0.4% to about 460,000. The level of air quality observed at the 4 monitoring stations was classified as Good for most of the days in 2006; the best air quality level was observed in June. The Northern District monitoring station recorded a total of 26 days of which the observed value of respirable suspended particulates was higher than the standard value. Besides, the Ka Ho monitoring station recorded the lowest pH value of rainwater, at 3.6 (precipitation with pH value lower than 5.6 is classified as acid rain). The quality of drinking water of the distribution networks and the Water Treatment Plants was conformed to the standard according to the results of the analysis carried out by the Laboratory of the Civic and Municipal Affairs Bureau. In addition, the approval rate of the samples taken from the 10 public swimming pools was over 90%, among which the water samples taken from 8 swimming pools all reached an approval rate of 100%. Water quality of Hac Sa and Cheoc Van beaches was classified as “not good enough”, yet adequate to use. In 2006, Companhia de Sistemas de Resíduos (CSR) collected 168,000 tonnes of domestic waste and 56,000 tonnes of waste from the business sector, which increased by 3.5% and 0.8% respectively compared with 2005. In addition, volume of waste sent to the Incineration Plant rose by 2.7% over 2005 to 286,000 tonnes. The average volume of waste water treated by all the Waste Water Treatment Plants (WWTP) in Macao was 152,000 m3 per day, down by 0.4% over 2005. In 2006, Public Security Police received 3,173 cases of noise complaints, up by 17.0% over 2005. The principal causes of complaints included noises from construction works, shouting, as well as music and karaoke. At the same time, the Environment Council received 101 cases of noise complaints, up by 6.3% over 2005. With regard to educational activities on environmental protection, the Civic and Municipal Affairs Bureau and the Environment Council organized 265 promotional activities in 2006; total expenses amounted to MOP2.96 million whilst more than 160,000 persons participated in these activities.
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