- Area, mobile and stationary sources must minimize their emissions in processes and activities.

- The general public should refrain from burning waste, and avoid outdoor activities (even in backyards or gardens), especially children, the elderly, pregnant women, and people with respiratory and/or respiratory diseases. (even in backyards or gardens), especially children, elderly people, pregnant women, and people with respiratory and/or cardiac diseases. heart disease.

- Schools should suspend outdoor activities, and sports leagues should suspend practices and games.

In order to protect the health of the population, the Government of the State of Nuevo Leon, through the Ministry of Environment, issues the ALERT phase of the through the Ministry of the Environment, the ALERT phase of the Response to Atmospheric Response to Atmospheric Contingencies, due to high concentrations of particulate matter less than 10 micrometers (PM10) in the Metropolitan Zone of Monterrey.

The strong winds that have been registered in the MCMA, with wind speeds of over 25 km/h, combined with low wind conditions, have wind speeds in excess of 25 km/h, combined with low humidity conditions, have led to dust humidity conditions, have resulted in the suspension of dust, with an increase in PM10 concentrations, reaching PM10 concentrations, reaching Alert level based on the guidelines established in the Congestion established in the Contingency Response Program and the Air and Health Index.

Therefore, the following actions established in the Contingency Response Program MUST be carried out to avoid particulate emissions. Contingency Response Program to avoid emissions of particulate pollutants and risks to the population. emissions and risks to the population:

STATIONARY SOURCES (INDUSTRY)

Federal competition companies

- Use anti-pollution equipment.

- Moistening of yards, buildings and roads.

- Reduce outdoor activities, maintenance, painting and welding, or other activities that generate the pollutant for which the that generate the pollutant for which the Alert was issued.

- The refinery must minimize emissions from all its operational and auxiliary activities and processes. and auxiliary processes.

The actions MUST be monitored by the competent federal authorities.

Companies under municipal jurisdiction

- Reduce outdoor activities, maintenance, painting and welding, or other activities that generate the pollutant for which the generate the pollutant for which the Alert was issued.

- Clean and keep humidified the work areas where urban maintenance works are carried out, especially paving. maintenance work, especially paving.

Food processing establishments.

- They must minimize their emissions.

The actions MUST be monitored by the competent municipal authorities.

State-owned companies

- Take additional actions to minimize the emission of particulate matter in yards by covering or wetting bulk materials or humidifying materials stored in bulk; reducing outdoor activities, maintenance, painting and maintenance, painting and welding, or other activities that generate the pollutant for which the alert was issued. the pollutant for which the Alert was decreed.

- Keep paved areas clean and irrigate surfaces that lack some type of surface treatment. of some type of surface treatment.

- Maintain in optimal operation the anti-pollution systems of its emission-generating equipment. emissions,

- Extreme humidification measures in patios, roads and any surface that lacks a surface treatment, and minimize the transit of vehicles on roads that are not surface treatment, and minimize vehicle traffic on unpaved roads. paved roads.

- In the case of companies extracting materials not reserved to the federation, guarantee the humidification of their yards, and ensure that stored materials are in closed areas, have some type of cover or are sufficiently humidified. humidification in their yards, and ensure that stored materials are in enclosed areas, have some type of cover or are sufficiently humidified to avoid particle resuspension. to avoid resuspension of particles.

The State Attorney General's Office will review compliance with the aforementioned actions. actions.

AREA SOURCES

Constructions

- They must keep all surfaces that do not have vegetation cover sufficiently humidified to minimize the generation of emissions. to minimize the generation of emissions, and take the necessary measures to prevent resuspension of particles necessary to avoid resuspension of particulate matter from bulk storage and vehicle transit. during vehicle traffic.

- For the activity of transporting construction materials, they must keep the material moist and the boxes must be sealed using tarpaulins that prevent the dispersion of the material. and the boxes must be sealed using tarpaulins that prevent the dispersion of materials. materials.

Management of urban solid waste and/or special handling waste

- Ensure that there is no open burning of fuels or any material, including for fire brigade training. for fire brigade training.

- Burning of garbage is prohibited under any circumstances.

Particulate matter emissions on internal and external roads and highways at waste management sites MUST be minimized. of waste management sites.

These actions must be supervised by state and/or municipal authorities according to their competencies.

MOBILE SOURCES (automotive vehicles)

Federal, State and Municipal Authorities shall ensure that no ostensibly polluting vehicles are circulating in their ostensibly polluting vehicles under their jurisdiction.

In addition, they must ensure that road and non-road vehicles used on their sites minimize their emissions. minimize their emissions.

SCHOOLS AND EDUCATIONAL FACILITIES

- Follow up on air quality monitoring.

- Cancel civic, cultural, sports and outdoor recreational activities.

- Keep doors and windows closed.

- Turn off vehicle engines of school transportation and private cars during waiting times. waiting times.

- Moisturize areas without vegetation cover.

- Keep the medical service alert to attend to any discomfort of students and school personnel. staff.

CHILDREN'S SPORTS LEAGUES

- No outdoor activities.

- Suspend rehearsals, sports practices and games.

GENERAL POPULATION

- Avoid outdoor activities (even in patios and gardens).

- Sensitive groups such as children under 12 years old, adults over 65 years old, pregnant women and people with bronchial-respiratory and cardiovascular conditions should be kept indoors. cardiovascular diseases should be kept indoors.

- If respiratory tract discomfort occurs, call for medical attention.

- Refrain from exercising outdoors.

- Do not use pyrotechnics.

- Refrain from lighting bonfires.

- Perform periodic maintenance of vehicles.

- Do not use the vehicle for short distances or keep it running unnecessarily.

The ALERT will be maintained as long as current air quality conditions prevail. air quality conditions prevail. The State Government will promptly communicate any changes in the in this regard.

For more information and air quality monitoring, consult the official information of the SIMA monitoring network, available on the SIMA website. the SIMA monitoring network, available at http://aire.nl.gob.mx/icars2020/map_calidad_icars.phpon the AIREMTY application for mobile devices AIREMTY and on the social networks of the Secretariat of the Environment.