San Borja registered high levels of air pollution

The National Institute of Statistics and Informatics (INEI) informed that according to the data provided by the National Service of Meteorology and Hydrology (SENAMHI), during May of 2025, the station Lima Center, placed in San Borja, registered high levels of inhalable particle concentration such as dust, soot and other solid and liquid substances dispersed in the air, responsible of generating respiratory problems in the population.

The technical report Environmental Statistics also stated that, in the east area, the station of Santa Anita registered similar results. In this area, air pollutants exceed the allowed limits, which represented a significant risk for health, specially of persons with respiratory diseases.

On the other hand, the stations placed in San Martín de Porres, Campo de Marte and San Juan de Lurigancho —in the north, center and east areas, respectively— showed low levels of air pollution, a favorable result for the health of the population health.

During May of 2025, the monitoring of the SENAMHI registered moderate levels of ultraviolet radiation in Lima Metropolitan area, with a value of 4, which entails the need to protect the skin and sight.

The INEI informed that according to the information of SEDAPAL, the production of potable water in Lima Metropolitan area reached 67,959 000 cubic meters, which represented a slight decrease of 0.5% compared to the same month of 2024.

During May of 2025, the flow of Rimac River was of 42.67 m³/s, which meant an increase of 77.6% and 63.6% compared to the same month of 2024 and compared to its historic average, respectively.

On the other hand, the average flow of the Chillon River was of 4.80 m³/s, registering an increase of 96.7% and 38.7% compared with May of 2024 and compared to its historic average.

According to data of 17 SENAMHI stations, in May of 2025 the departments of Tacna, Puno and Arequipa registered the lowest temperatures of the country.

In Tacna, were registered the extremely low minimum temperatures in the stations of Chuapalca (-19.5 °C) and Bocatoma (-14.0 °C). In Puno, the lowest temperatures were registered in Mazo Cruz (-15.2 °C), Macusani (-10.0 °C), Crucero Alto (-8.8 °C), Santa Rosa (-8.0 °C), Cojata (-7.5 °C) and Desaguadero (-6.6 °C). In Arequipa, the coldest stations were Pillones (-12.8 °C), Imata (-11.2 °C), Las Salinas (-10.8 °C) and Tisco (-9.5 °C).

Also registered lowest temperatures in Junin (Laive: -4.3 °C and La Oroya: -1.5 °C), Cusco (Sicuani: -3.4 °C), Pasco (Cerro de Pasco: -1.6 °C) and Moquegua (Ubinas: -0.8 °C).

During May 2025, the rivers of the North Pacific slope registered a considerable increase in its average flow, according to SENAMHI.

The Jequetepeque River reached 65.69 m³/s, which meant an increase of 216.7% and 131.1% compared to May of 2024 against its historic average.

The Chira River, with 163.09 m³/s, increased its flow by 175.3% and 21.3%, compared to the same month of 2024 and to its historic average, respectively.

The Calvas River totalized 73.54 m³/s, increasing by 156.1% and by 48.7% compared to May of 2024 and compared to its historic average respectively.

Finally, the Tumbes River registered a flow of 229.26 m³/s, with an increase of 57.4% and 68.4% compared to the same month of the last year and compared to its historic average respectively.

According to the National Institute of Civil Defense (INDECI), in May of 2025 were registered 429 emergencies at national level, which represented an increase of 19.2% compared to the same month of 2024.

The emergencies left 3,031 affected people, 1,685 affected homes, 140 homes destroyed and 135 hectares of cultivated land lost.

The departments with greater number of emergencies were: Cajamarca (66), Ancash (44), Cusco (40), Lima (32), Amazonas (27), Huancavelica (26), Apurímac and Huánuco (25 each one), La Libertad

(24), Piura (19), Ucayali (18), Ayacucho and Pasco (16 each one), Junín (10), San Martín (9), Arequipa (8), Loreto (7), Tacna (4), Ica, Lambayeque and Puno (3 each one), Tumbes (2), Madre de Dios and Moquegua (1 each one).

The main causes were: heavy rains (221 cases), urban and industrial fires (74), strong winds (41), landslides (31), soil erosion (21), floods (12), collapses and low temperatures (7), earthquakes, huaycos and storm surges (4 in each case), and finally, pests, avalanches and transportation accidents (1 each one).