Information from the Statistics and Census Service indicated that total land area of Macao measured 28.2 km2 in 2005 and the population density reached 17,310 persons per km2. Total lane length of public roads was 368.2 km, density of motor vehicles was 414 vehicles per km. At the end of 2005, number of trees planted on the roadside in Macao totalled 10,629, up by 11.5% over 2004; number of trees in the replantation area of the Islands increased slightly by 0.4% compared with 2004. The level of air quality observed at the 4 monitoring stations was classified as Good for most of the days in 2005; the best air quality level was observed in May. The Northern District monitoring station recorded a total of 35 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 3.4 (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 9 public swimming pools was over 90%, among which the water samples taken from 7 swimming pools all reached an approval rate of 100%. Water quality of the Cheoc Van and Hac Sa beaches was classified as “Acceptable”. In 2005, Companhia de Sistemas de Resíduos (CSR) collected 162,000 tonnes of domestic waste and 55,000 tonnes of waste from the business sector, which increased by 4.9% and 7.7% respectively compared with 2004. In addition, volume of waste sent to the Incineration Plant rose by 8.9% over 2004 to 279,000 tonnes. The average volume of waste water treated by all the Waste Water Treatment Plants (WWTP) in Macao was 152,000 m3 per day, up by 0.9% over 2004. In 2005, Public Security Police received 2,713 cases of noise complaints, up by 0.7% over 2004. The principal causes of complaints included noises from construction works; conversation and shouting; as well as music and karaoke. At the same time, the Environment Council received 95 cases of noise complaints, a significant increase of 25.0% over 2004. With regard to educational activities on environmental protection, the Civic and Municipal Affairs Bureau and the Environment Council organized 157 promotional activities; total expenses amounted to MOP4.49 million whilst more than 180,000 persons participated in these activities.
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