E/C.12/MDA/CO/3 psychological support and rehabilitation. It urges the State party to maintain harm reduction programmes for drug users. Environment 68. The Committee is concerned at the serious soil and groundwater pollution caused by landfill methods of waste disposal and the extensive use of agricultural chemicals and persistent organic pollutants, including pesticides and insecticides (arts. 11 and 12). 69. The Committee recommends that the State party use environmentally-friendly methods to manage, monitor, collect and treat waste, as an alternative to landfill methods; put in place appropriate waste-recycling programmes; and promote sustainable consumption and production patterns. It urges the State party to ensure that the use of harmful chemicals in agriculture is fully monitored and regulated. Right to education 70. The Committee is concerned at: (a) The low level of school enrolment among young people in rural areas and Roma children and the high dropout rates, including among children of Moldovan migrant workers abroad, at all levels of education; (b) The poor quality of education owing to poor educational materials and facilities and the insufficient recruitment of young teachers; (c) The insufficient provision of inclusive education for students with disabilities; (d) and 15). The limited opportunities for education in regional languages (arts. 13, 14 71. The Committee recommends that the State party strengthen its efforts to: (a) Counter low enrolment rates among Roma children and young people in the rural areas and the high dropout rates, including among children of Moldovan migrant workers abroad, at all levels of education; (b) Improve educational materials and school facilities, including water and sanitation facilities, and increase the number of young teachers, including by improving salaries and benefits; (c) Increase access to inclusive education for students with disabilities; (d) Increase the opportunities for students of regional languages to be taught in their mother tongue. The Committee draws the attention of the State party to its general comment No. 13 (1999) on the right to education. School optimization process 72. The Committee notes that under the school optimization process, 78 schools in rural areas have so far been closed, another 20 schools are to be closed by the end of 2017 and the affected students are provided with free transport to go to school. The Committee, however, is concerned at repeated reports that students often miss school and cannot participate in most extracurricular activities owing to inadequate transport services and that the vehicles provided are largely not accessible by students with physical disabilities (arts. 2 (2), 13 and 14). 73. The Committee urges the State party to take immediate and effective measures to ensure that students affected by the school optimization process are provided with all necessary support, including sufficient transport services, to participate in all school activities and that the vehicles provided are accessible by students with disabilities. The Committee recommends that the State party assess the impact of the optimization process on the fulfilment of its obligations under articles 13 and 14 of the Covenant and introduce any necessary revisions into the policy accordingly. 11